28390528 has 32 divisors (see below), whose sum is σ = 56827260. Its totient is φ = 14128128.

The previous prime is 28390519. The next prime is 28390543. The reversal of 28390528 is 82509382.

It can be written as a sum of positive squares in 2 ways, for example, as 25321024 + 3069504 = 5032^2 + 1752^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37126 + ... + 37882.

Almost surely, 2^28390528 is an apocalyptic number.

It is an amenable number.

28390528 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

28390528 is an equidigital number, since it uses as much as digits as its factorization.

28390528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1064 (or 1052 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 28390528 is about 5328.2762691137. The cubic root of 28390528 is about 305.0641377255.

The spelling of 28390528 in words is "twenty-eight million, three hundred ninety thousand, five hundred twenty-eight".