2645000000 has 168 divisors, whose sum is σ = 6858478536. Its totient is φ = 1012000000.

The previous prime is 2644999997. The next prime is 2645000081. The reversal of 2645000000 is 5462.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 4 ways, for example, as 2616527104 + 28472896 = 51152^2 + 5336^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 114999989 + ... + 115000011.

It is an arithmetic number, because the mean of its divisors is an integer number (40824277).

Almost surely, 2^2645000000 is an apocalyptic number.

2645000000 is a gapful number since it is divisible by the number (20) 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 2645000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3429239268).

2645000000 is an abundant number, since it is smaller than the sum of its proper divisors (4213478536).

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

2645000000 is an frugal number, since it uses more digits than its factorization.

2645000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93 (or 30 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 2645000000 is about 51429.5634824952. The cubic root of 2645000000 is about 1382.9566239282.

Adding to 2645000000 its reverse (5462), we get a palindrome (2645005462).

The spelling of 2645000000 in words is "two billion, six hundred forty-five million", and thus it is an aban number.