28087924 has 6 divisors (see below), whose sum is σ = 49153874. Its totient is φ = 14043960.

The previous prime is 28087919. The next prime is 28087931. The reversal of 28087924 is 42978082.

It can be written as a sum of positive squares in only one way, i.e., 22944100 + 5143824 = 4790^2 + 2268^2 .

It is a congruent number.

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 as a sum of consecutive naturals, namely, 3510987 + ... + 3510994.

Almost surely, 2^28087924 is an apocalyptic number.

It is an amenable number.

28087924 is a deficient number, since it is larger than the sum of its proper divisors (21065950).

28087924 is a wasteful number, since it uses less digits than its factorization.

28087924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7021985 (or 7021983 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 28087924 is about 5299.8041473247. The cubic root of 28087924 is about 303.9764091804.

The spelling of 28087924 in words is "twenty-eight million, eighty-seven thousand, nine hundred twenty-four".