28707880356 has 45 divisors (see below), whose sum is σ = 75056043601. Its totient is φ = 9568276848.

The previous prime is 28707880351. The next prime is 28707880379. The reversal of 28707880356 is 65308870782.

The square root of 28707880356 is 169434.

It is a perfect power (a square), and thus also a powerful number.

28707880356 is a `hidden beast` number, since 287 + 0 + 7 + 8 + 8 + 0 + 356 = 666.

It can be written as a sum of positive squares in only one way, i.e., 28659104100 + 48776256 = 169290^2 + 6984^2 .

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28707880351) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 3045106 + ... + 3054518.

Almost surely, 2^28707880356 is an apocalyptic number.

28707880356 is the 169434-th square number.

It is an amenable number.

28707880356 is an abundant number, since it is smaller than the sum of its proper divisors (46348163245).

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

28707880356 is an frugal number, since it uses more digits than its factorization.

28707880356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18842 (or 9418 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 54.

The spelling of 28707880356 in words is "twenty-eight billion, seven hundred seven million, eight hundred eighty thousand, three hundred fifty-six".