53644403688 has 32 divisors (see below), whose sum is σ = 134243460000. Its totient is φ = 17863807808.

The previous prime is 53644403663. The next prime is 53644403699. The reversal of 53644403688 is 88630444635.

It is a happy number.

It is a super-2 number, since 2×53644403688² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 53644403688.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1078938 + ... + 1127561.

It is an arithmetic number, because the mean of its divisors is an integer number (4195108125).

Almost surely, 2^53644403688 is an apocalyptic number.

It is an amenable number.

53644403688 is an abundant number, since it is smaller than the sum of its proper divisors (80599056312).

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

53644403688 is a wasteful number, since it uses less digits than its factorization.

53644403688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2207521 (or 2207517 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 51.

The spelling of 53644403688 in words is "fifty-three billion, six hundred forty-four million, four hundred three thousand, six hundred eighty-eight".