28552644 has 18 divisors (see below), whose sum is σ = 72174830. Its totient is φ = 9517536.

The previous prime is 28552633. The next prime is 28552651. The reversal of 28552644 is 44625582.

It is a happy number.

28552644 is a `hidden beast` number, since 2 + 8 + 5 + 5 + 2 + 644 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18818244 + 9734400 = 4338^2 + 3120^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 793129 = 28552644 / (2 + 8 + 5 + 5 + 2 + 6 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 28552599 and 28552608.

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, 396529 + ... + 396600.

Almost surely, 2^28552644 is an apocalyptic number.

It is an amenable number.

28552644 is an abundant number, since it is smaller than the sum of its proper divisors (43622186).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28552644 is a wasteful number, since it uses less digits than its factorization.

28552644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793139 (or 793134 counting only the distinct ones).

The product of its digits is 76800, while the sum is 36.

The square root of 28552644 is about 5343.4674135808. The cubic root of 28552644 is about 305.6436965239.

The spelling of 28552644 in words is "twenty-eight million, five hundred fifty-two thousand, six hundred forty-four".