647807172936 has 128 divisors (see below), whose sum is σ = 2019359462400. Its totient is φ = 168243252480.

The previous prime is 647807172931. The next prime is 647807172937. The reversal of 647807172936 is 639271708746.

It is a super-2 number, since 2×647807172936² (a number of 24 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 647807172936.

It is not an unprimeable number, because it can be changed into a prime (647807172931) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28187146 + ... + 28210118.

It is an arithmetic number, because the mean of its divisors is an integer number (15776245800).

Almost surely, 2^647807172936 is an apocalyptic number.

647807172936 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

647807172936 is an abundant number, since it is smaller than the sum of its proper divisors (1371552289464).

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

647807172936 is a wasteful number, since it uses less digits than its factorization.

647807172936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38259 (or 38255 counting only the distinct ones).

The product of its (nonzero) digits is 21337344, while the sum is 60.

The spelling of 647807172936 in words is "six hundred forty-seven billion, eight hundred seven million, one hundred seventy-two thousand, nine hundred thirty-six".