12520644400 has 90 divisors (see below), whose sum is σ = 33064200596. Its totient is φ = 4552944000.

The previous prime is 12520644397. The next prime is 12520644401. The reversal of 12520644400 is 444602521.

It is not an unprimeable number, because it can be changed into a prime (12520644401) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 80946 + ... + 177745.

Almost surely, 2^12520644400 is an apocalyptic number.

12520644400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12520644400 is an abundant number, since it is smaller than the sum of its proper divisors (20543556196).

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

12520644400 is a wasteful number, since it uses less digits than its factorization.

12520644400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258731 (or 258709 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

The spelling of 12520644400 in words is "twelve billion, five hundred twenty million, six hundred forty-four thousand, four hundred".