28520232 has 32 divisors (see below), whose sum is σ = 76786080. Its totient is φ = 8775360.

The previous prime is 28520221. The next prime is 28520243. The reversal of 28520232 is 23202582.

It is an interprime number because it is at equal distance from previous prime (28520221) and next prime (28520243).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45394 + ... + 46017.

It is an arithmetic number, because the mean of its divisors is an integer number (2399565).

Almost surely, 2^28520232 is an apocalyptic number.

It is an amenable number.

28520232 is an abundant number, since it is smaller than the sum of its proper divisors (48265848).

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

28520232 is a wasteful number, since it uses less digits than its factorization.

28520232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91433 (or 91429 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 28520232 is about 5340.4336902540. The cubic root of 28520232 is about 305.5280005908.

The spelling of 28520232 in words is "twenty-eight million, five hundred twenty thousand, two hundred thirty-two".