28705672 has 8 divisors (see below), whose sum is σ = 53823150. Its totient is φ = 14352832.

The previous prime is 28705669. The next prime is 28705687. The reversal of 28705672 is 27650782.

It can be written as a sum of positive squares in only one way, i.e., 27941796 + 763876 = 5286^2 + 874^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1794097 + ... + 1794112.

Almost surely, 2^28705672 is an apocalyptic number.

It is an amenable number.

28705672 is a deficient number, since it is larger than the sum of its proper divisors (25117478).

28705672 is a wasteful number, since it uses less digits than its factorization.

28705672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3588215 (or 3588211 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 28705672 is about 5357.7674454944. The cubic root of 28705672 is about 306.1887567664.

The spelling of 28705672 in words is "twenty-eight million, seven hundred five thousand, six hundred seventy-two".