64157117728 has 48 divisors (see below), whose sum is σ = 138226906944. Its totient is φ = 29070280960.

The previous prime is 64157117711. The next prime is 64157117729. The reversal of 64157117728 is 82771175146.

64157117728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×64157117728² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64157117729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175900 + ... + 399067.

It is an arithmetic number, because the mean of its divisors is an integer number (2879727228).

Almost surely, 2^64157117728 is an apocalyptic number.

It is an amenable number.

64157117728 is an abundant number, since it is smaller than the sum of its proper divisors (74069789216).

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

64157117728 is a wasteful number, since it uses less digits than its factorization.

64157117728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575305 (or 575297 counting only the distinct ones).

The product of its digits is 658560, while the sum is 49.

The spelling of 64157117728 in words is "sixty-four billion, one hundred fifty-seven million, one hundred seventeen thousand, seven hundred twenty-eight".