28687684 has 12 divisors (see below), whose sum is σ = 50257900. Its totient is φ = 14328288.

The previous prime is 28687667. The next prime is 28687697. The reversal of 28687684 is 48678682.

It can be written as a sum of positive squares in 2 ways, for example, as 16240900 + 12446784 = 4030^2 + 3528^2 .

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, 922 + ... + 7630.

Almost surely, 2^28687684 is an apocalyptic number.

It is an amenable number.

28687684 is a deficient number, since it is larger than the sum of its proper divisors (21570216).

28687684 is a wasteful number, since it uses less digits than its factorization.

28687684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7782 (or 7780 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 49.

The square root of 28687684 is about 5356.0884981486. The cubic root of 28687684 is about 306.1247871300.

The spelling of 28687684 in words is "twenty-eight million, six hundred eighty-seven thousand, six hundred eighty-four".