28684503225 has 81 divisors (see below), whose sum is σ = 59802310893. Its totient is φ = 13104786240.

The previous prime is 28684503203. The next prime is 28684503241. The reversal of 28684503225 is 52230548682.

The square root of 28684503225 is 169365.

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

28684503225 is a `hidden beast` number, since 286 + 8 + 45 + 0 + 322 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 7112889 + 28677390336 = 2667^2 + 169344^2 .

It is not a de Polignac number, because 28684503225 - 2¹⁵ = 28684470457 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 17782519 + ... + 17784131.

Almost surely, 2^28684503225 is an apocalyptic number.

28684503225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28684503225 is the 169365-th square number.

28684503225 is the 84683-rd centered octagonal number.

It is an amenable number.

28684503225 is an abundant number, since it is smaller than the sum of its proper divisors (31117807668).

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

28684503225 is an equidigital number, since it uses as much as digits as its factorization.

28684503225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3256 (or 1628 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 45.

The spelling of 28684503225 in words is "twenty-eight billion, six hundred eighty-four million, five hundred three thousand, two hundred twenty-five".