28655659872 has 192 divisors, whose sum is σ = 96945891840. Its totient is φ = 8065018368.

The previous prime is 28655659847. The next prime is 28655659883. The reversal of 28655659872 is 27895655682.

28655659872 is a `hidden beast` number, since 2 + 8 + 6 + 556 + 5 + 9 + 8 + 72 = 666.

It is a super-2 number, since 2×28655659872² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 369858 + ... + 440574.

It is an arithmetic number, because the mean of its divisors is an integer number (504926520).

Almost surely, 2^28655659872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28655659872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48472945920).

28655659872 is an abundant number, since it is smaller than the sum of its proper divisors (68290231968).

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

28655659872 is a wasteful number, since it uses less digits than its factorization.

28655659872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70810 (or 70796 counting only the distinct ones).

The product of its digits is 72576000, while the sum is 63.

The spelling of 28655659872 in words is "twenty-eight billion, six hundred fifty-five million, six hundred fifty-nine thousand, eight hundred seventy-two".