28574183521 has 9 divisors (see below), whose sum is σ = 30943655379. Its totient is φ = 26374140936.

The previous prime is 28574183509. The next prime is 28574183531. The reversal of 28574183521 is 12538147582.

It is a happy number.

The square root of 28574183521 is 169039.

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

It can be written as a sum of positive squares in only one way, i.e., 4226950225 + 24347233296 = 65015^2 + 156036^2 .

It is not a de Polignac number, because 28574183521 - 2¹⁵ = 28574150753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28574183501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2191006 + ... + 2204008.

It is an arithmetic number, because the mean of its divisors is an integer number (3438183931).

Almost surely, 2^28574183521 is an apocalyptic number.

28574183521 is the 169039-th square number.

28574183521 is the 84520-th centered octagonal number.

It is an amenable number.

28574183521 is a deficient number, since it is larger than the sum of its proper divisors (2369471858).

28574183521 is an frugal number, since it uses more digits than its factorization.

28574183521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26032 (or 13016 counting only the distinct ones).

The product of its digits is 537600, while the sum is 46.

The spelling of 28574183521 in words is "twenty-eight billion, five hundred seventy-four million, one hundred eighty-three thousand, five hundred twenty-one".