28757992 has 16 divisors (see below), whose sum is σ = 54065700. Its totient is φ = 14340480.

The previous prime is 28757977. The next prime is 28758011. The reversal of 28757992 is 29975782.

It can be written as a sum of positive squares in 2 ways, for example, as 27604516 + 1153476 = 5254^2 + 1074^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1509 + ... + 7732.

Almost surely, 2^28757992 is an apocalyptic number.

It is an amenable number.

28757992 is a deficient number, since it is larger than the sum of its proper divisors (25307708).

28757992 is a wasteful number, since it uses less digits than its factorization.

28757992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9636 (or 9632 counting only the distinct ones).

The product of its digits is 635040, while the sum is 49.

The square root of 28757992 is about 5362.6478534396. The cubic root of 28757992 is about 306.3746674446.

The spelling of 28757992 in words is "twenty-eight million, seven hundred fifty-seven thousand, nine hundred ninety-two".