1625000000 has 140 divisors (see below), whose sum is σ = 4340819868. Its totient is φ = 600000000.

The previous prime is 1624999991. The next prime is 1625000033. The reversal of 1625000000 is 5261.

It can be written as a sum of positive squares in 10 ways, for example, as 3810304 + 1621189696 = 1952^2 + 40264^2 .

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 124999994 + ... + 125000006.

Almost surely, 2^1625000000 is an apocalyptic number.

1625000000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1625000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2170409934).

1625000000 is an abundant number, since it is smaller than the sum of its proper divisors (2715819868).

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

1625000000 is an frugal number, since it uses more digits than its factorization.

1625000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70 (or 20 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 1625000000 is about 40311.2887414927. The cubic root of 1625000000 is about 1175.6673438604.

Adding to 1625000000 its reverse (5261), we get a palindrome (1625005261).

It can be divided in two parts, 16 and 25000000, that multiplied together give a square (400000000 = 20000²).

The spelling of 1625000000 in words is "one billion, six hundred twenty-five million", and thus it is an aban number.