28170724 has 6 divisors (see below), whose sum is σ = 49298774. Its totient is φ = 14085360.

The previous prime is 28170677. The next prime is 28170733. The reversal of 28170724 is 42707182.

It can be written as a sum of positive squares in only one way, i.e., 27984100 + 186624 = 5290^2 + 432^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3521337 + ... + 3521344.

Almost surely, 2^28170724 is an apocalyptic number.

It is an amenable number.

28170724 is a deficient number, since it is larger than the sum of its proper divisors (21128050).

28170724 is a wasteful number, since it uses less digits than its factorization.

28170724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7042685 (or 7042683 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 28170724 is about 5307.6100082806. The cubic root of 28170724 is about 304.2748120941.

The spelling of 28170724 in words is "twenty-eight million, one hundred seventy thousand, seven hundred twenty-four".