28088645 has 16 divisors (see below), whose sum is σ = 36528240. Its totient is φ = 20734272.

The previous prime is 28088639. The next prime is 28088647. The reversal of 28088645 is 54688082.

It can be written as a sum of positive squares in 8 ways, for example, as 21967969 + 6120676 = 4687^2 + 2474^2 .

It is not a de Polignac number, because 28088645 - 2¹⁶ = 28023109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28088647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9707 + ... + 12263.

It is an arithmetic number, because the mean of its divisors is an integer number (2283015).

Almost surely, 2^28088645 is an apocalyptic number.

It is an amenable number.

28088645 is a deficient number, since it is larger than the sum of its proper divisors (8439595).

28088645 is an equidigital number, since it uses as much as digits as its factorization.

28088645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2601 (or 2575 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 41.

The square root of 28088645 is about 5299.8721682697. The cubic root of 28088645 is about 303.9790101216.

The spelling of 28088645 in words is "twenty-eight million, eighty-eight thousand, six hundred forty-five".