28569025 has 9 divisors (see below), whose sum is σ = 35458761. Its totient is φ = 22833840.

The previous prime is 28569017. The next prime is 28569041. The reversal of 28569025 is 52096582.

It is a happy number.

The square root of 28569025 is 5345.

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

It can be written as a sum of positive squares in 4 ways, for example, as 859329 + 27709696 = 927^2 + 5264^2 .

It is not a de Polignac number, because 28569025 - 2³ = 28569017 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 26191 + ... + 27259.

Almost surely, 2^28569025 is an apocalyptic number.

28569025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28569025 is the 5345-th square number.

28569025 is the 2673-rd centered octagonal number.

It is an amenable number.

28569025 is a deficient number, since it is larger than the sum of its proper divisors (6889736).

28569025 is an frugal number, since it uses more digits than its factorization.

28569025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2148 (or 1074 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 37.

The cubic root of 28569025 is about 305.7021358547.

It can be divided in two parts, 2856 and 9025, that added together give a square (11881 = 109²).

The spelling of 28569025 in words is "twenty-eight million, five hundred sixty-nine thousand, twenty-five".