28524169881 has 27 divisors (see below), whose sum is σ = 43498895349. Its totient is φ = 18009185112.

The previous prime is 28524169859. The next prime is 28524169987. The reversal of 28524169881 is 18896142582.

The square root of 28524169881 is 168891.

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

28524169881 is a `hidden beast` number, since 28 + 524 + 1 + 6 + 98 + 8 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-28524169881 is a prime.

It is a super-2 number, since 2×28524169881² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28524165881) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 9625306 + ... + 9628268.

Almost surely, 2^28524169881 is an apocalyptic number.

28524169881 is the 168891-st square number.

28524169881 is the 84446-th centered octagonal number.

It is an amenable number.

28524169881 is a deficient number, since it is larger than the sum of its proper divisors (14974725468).

28524169881 is an frugal number, since it uses more digits than its factorization.

28524169881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5970 (or 2985 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 54.

The spelling of 28524169881 in words is "twenty-eight billion, five hundred twenty-four million, one hundred sixty-nine thousand, eight hundred eighty-one".