28645025 has 6 divisors (see below), whose sum is σ = 35519862. Its totient is φ = 22916000.

The previous prime is 28644997. The next prime is 28645033. The reversal of 28645025 is 52054682.

It can be written as a sum of positive squares in 3 ways, for example, as 6677056 + 21967969 = 2584^2 + 4687^2 .

It is not a de Polignac number, because 28645025 - 2⁸ = 28644769 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28644982 and 28645000.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 572876 + ... + 572925.

It is an arithmetic number, because the mean of its divisors is an integer number (5919977).

Almost surely, 2^28645025 is an apocalyptic number.

28645025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28645025 is a deficient number, since it is larger than the sum of its proper divisors (6874837).

28645025 is a wasteful number, since it uses less digits than its factorization.

28645025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1145811 (or 1145806 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

The square root of 28645025 is about 5352.1047261802. The cubic root of 28645025 is about 305.9729745309.

The spelling of 28645025 in words is "twenty-eight million, six hundred forty-five thousand, twenty-five".