64911538728 has 32 divisors (see below), whose sum is σ = 180309830400. Its totient is φ = 21637179504.

The previous prime is 64911538669. The next prime is 64911538733. The reversal of 64911538728 is 82783511946.

64911538728 is a `hidden beast` number, since 6 + 491 + 1 + 53 + 87 + 28 = 666.

64911538728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 150257976 + ... + 150258407.

It is an arithmetic number, because the mean of its divisors is an integer number (5634682200).

Almost surely, 2^64911538728 is an apocalyptic number.

It is an amenable number.

64911538728 is an abundant number, since it is smaller than the sum of its proper divisors (115398291672).

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

64911538728 is a wasteful number, since it uses less digits than its factorization.

64911538728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300516398 (or 300516388 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The spelling of 64911538728 in words is "sixty-four billion, nine hundred eleven million, five hundred thirty-eight thousand, seven hundred twenty-eight".