28757812 has 18 divisors (see below), whose sum is σ = 53462822. Its totient is φ = 13532544.

The previous prime is 28757809. The next prime is 28757873. The reversal of 28757812 is 21875782.

It can be written as a sum of positive squares in 3 ways, for example, as 2808976 + 25948836 = 1676^2 + 5094^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11283 + ... + 13594.

Almost surely, 2^28757812 is an apocalyptic number.

It is an amenable number.

28757812 is a deficient number, since it is larger than the sum of its proper divisors (24705010).

28757812 is a wasteful number, since it uses less digits than its factorization.

28757812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24915 (or 24896 counting only the distinct ones).

The product of its digits is 62720, while the sum is 40.

The square root of 28757812 is about 5362.6310706593. The cubic root of 28757812 is about 306.3740282303.

The spelling of 28757812 in words is "twenty-eight million, seven hundred fifty-seven thousand, eight hundred twelve".