28057924 has 6 divisors (see below), whose sum is σ = 49101374. Its totient is φ = 14028960.

The previous prime is 28057891. The next prime is 28057937. The reversal of 28057924 is 42975082.

It can be written as a sum of positive squares in only one way, i.e., 15681600 + 12376324 = 3960^2 + 3518^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3507237 + ... + 3507244.

Almost surely, 2^28057924 is an apocalyptic number.

It is an amenable number.

28057924 is a deficient number, since it is larger than the sum of its proper divisors (21043450).

28057924 is a wasteful number, since it uses less digits than its factorization.

28057924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7014485 (or 7014483 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 28057924 is about 5296.9730979117. The cubic root of 28057924 is about 303.8681474604.

The spelling of 28057924 in words is "twenty-eight million, fifty-seven thousand, nine hundred twenty-four".