28648625 has 8 divisors (see below), whose sum is σ = 35753640. Its totient is φ = 22918800.

The previous prime is 28648601. The next prime is 28648657. The reversal of 28648625 is 52684682.

It can be written as a sum of positive squares in 4 ways, for example, as 9006001 + 19642624 = 3001^2 + 4432^2 .

It is not a de Polignac number, because 28648625 - 2⁸ = 28648369 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114470 + ... + 114719.

It is an arithmetic number, because the mean of its divisors is an integer number (4469205).

Almost surely, 2^28648625 is an apocalyptic number.

28648625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28648625 is a deficient number, since it is larger than the sum of its proper divisors (7105015).

28648625 is an equidigital number, since it uses as much as digits as its factorization.

28648625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229204 (or 229194 counting only the distinct ones).

The product of its digits is 184320, while the sum is 41.

The square root of 28648625 is about 5352.4410319031. The cubic root of 28648625 is about 305.9857918418.

The spelling of 28648625 in words is "twenty-eight million, six hundred forty-eight thousand, six hundred twenty-five".