28556645 has 16 divisors (see below), whose sum is σ = 37022832. Its totient is φ = 21020160.

The previous prime is 28556621. The next prime is 28556653. The reversal of 28556645 is 54665582.

It can be written as a sum of positive squares in 8 ways, for example, as 4330561 + 24226084 = 2081^2 + 4922^2 .

It is not a de Polignac number, because 28556645 - 2⁶ = 28556581 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29489 + ... + 30441.

It is an arithmetic number, because the mean of its divisors is an integer number (2313927).

Almost surely, 2^28556645 is an apocalyptic number.

It is an amenable number.

28556645 is a deficient number, since it is larger than the sum of its proper divisors (8466187).

28556645 is a wasteful number, since it uses less digits than its factorization.

28556645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1432.

The product of its digits is 288000, while the sum is 41.

The square root of 28556645 is about 5343.8417828375. The cubic root of 28556645 is about 305.6579721816.

The spelling of 28556645 in words is "twenty-eight million, five hundred fifty-six thousand, six hundred forty-five".