28155658776 has 64 divisors (see below), whose sum is σ = 81463065600. Its totient is φ = 7942641408.

The previous prime is 28155658759. The next prime is 28155658777. The reversal of 28155658776 is 67785655182.

It is a super-2 number, since 2×28155658776² (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 (28155658777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1047445 + ... + 1073988.

It is an arithmetic number, because the mean of its divisors is an integer number (1272860400).

Almost surely, 2^28155658776 is an apocalyptic number.

It is an amenable number.

28155658776 is an abundant number, since it is smaller than the sum of its proper divisors (53307406824).

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

28155658776 is a wasteful number, since it uses less digits than its factorization.

28155658776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121528 (or 2121524 counting only the distinct ones).

The product of its digits is 28224000, while the sum is 60.

The spelling of 28155658776 in words is "twenty-eight billion, one hundred fifty-five million, six hundred fifty-eight thousand, seven hundred seventy-six".