28759072225 has 27 divisors (see below), whose sum is σ = 38630242443. Its totient is φ = 21229328640.

The previous prime is 28759072187. The next prime is 28759072247. The reversal of 28759072225 is 52227095782.

The square root of 28759072225 is 169585.

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

It can be written as a sum of positive squares in 13 ways, for example, as 27217410529 + 1541661696 = 164977^2 + 39264^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28759072225 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 11021721 + ... + 11024329.

Almost surely, 2^28759072225 is an apocalyptic number.

28759072225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28759072225 is the 169585-th square number.

28759072225 is the 84793-rd centered octagonal number.

It is an amenable number.

28759072225 is a deficient number, since it is larger than the sum of its proper divisors (9871170218).

28759072225 is an frugal number, since it uses more digits than its factorization.

28759072225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5254 (or 2627 counting only the distinct ones).

The product of its (nonzero) digits is 1411200, while the sum is 49.

Multiplying 28759072225 by its sum of digits (49), we get a square (1409194539025 = 1187095²).

The spelling of 28759072225 in words is "twenty-eight billion, seven hundred fifty-nine million, seventy-two thousand, two hundred twenty-five".