2500000000 has 99 divisors (see below), whose sum is σ = 6237792841. Its totient is φ = 1000000000.

The previous prime is 2499999977. The next prime is 2500000001. The reversal of 2500000000 is 52.

The square root of 2500000000 is 50000.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 5 ways, for example, as 14379264 + 2485620736 = 3792^2 + 49856^2 .

It is a sliding number, since 2500000000 = 500000000 + 2000000000 and 1/500000000 + 1/2000000000 = 0.000000002500000000.

It is a hoax number, since the sum of its digits (7) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an enlightened number because it begins with the concatenation of its prime factors (25).

It is not an unprimeable number, because it can be changed into a prime (2500000001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 10 ways as a sum of consecutive naturals, for example, 499999998 + ... + 500000002.

Almost surely, 2^2500000000 is an apocalyptic number.

2500000000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

2500000000 is the 50000-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2500000000

2500000000 is an abundant number, since it is smaller than the sum of its proper divisors (3737792841).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2500000000 is an frugal number, since it uses more digits than its factorization.

2500000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66 (or 7 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 7.

The cubic root of 2500000000 is about 1357.2088082975.

Adding to 2500000000 its reverse (52), we get a palindrome (2500000052).

It can be divided in two parts, 2 and 500000000, that multiplied together give a 9-th power (1000000000 = 10⁹).

The spelling of 2500000000 in words is "two billion, five hundred million", and thus it is an aban number.