28508992 has 14 divisors (see below), whose sum is σ = 56572658. Its totient is φ = 14254464.

The previous prime is 28508959. The next prime is 28509011. The reversal of 28508992 is 29980582.

It can be written as a sum of positive squares in only one way, i.e., 27290176 + 1218816 = 5224^2 + 1104^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222663 + ... + 222790.

Almost surely, 2^28508992 is an apocalyptic number.

It is an amenable number.

28508992 is a deficient number, since it is larger than the sum of its proper divisors (28063666).

28508992 is an equidigital number, since it uses as much as digits as its factorization.

28508992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445465 (or 445455 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 28508992 is about 5339.3812375593. The cubic root of 28508992 is about 305.4878584914.

The spelling of 28508992 in words is "twenty-eight million, five hundred eight thousand, nine hundred ninety-two".