28257168464 has 40 divisors (see below), whose sum is σ = 62783064960. Its totient is φ = 12068869248.

The previous prime is 28257168437. The next prime is 28257168469. The reversal of 28257168464 is 46486175282.

It is a super-2 number, since 2×28257168464² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28257168469) 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, 397724 + ... + 463355.

It is an arithmetic number, because the mean of its divisors is an integer number (1569576624).

Almost surely, 2^28257168464 is an apocalyptic number.

It is an amenable number.

28257168464 is an abundant number, since it is smaller than the sum of its proper divisors (34525896496).

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

28257168464 is a wasteful number, since it uses less digits than its factorization.

28257168464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861387 (or 861381 counting only the distinct ones).

The product of its digits is 5160960, while the sum is 53.

The spelling of 28257168464 in words is "twenty-eight billion, two hundred fifty-seven million, one hundred sixty-eight thousand, four hundred sixty-four".