28513684 has 12 divisors (see below), whose sum is σ = 50045184. Its totient is φ = 14215064.

The previous prime is 28513679. The next prime is 28513691. The reversal of 28513684 is 48631582.

It is a happy number.

It is a congruent number.

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, 8884 + ... + 11659.

It is an arithmetic number, because the mean of its divisors is an integer number (4170432).

Almost surely, 2^28513684 is an apocalyptic number.

It is an amenable number.

28513684 is a deficient number, since it is larger than the sum of its proper divisors (21531500).

28513684 is a wasteful number, since it uses less digits than its factorization.

28513684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20894 (or 20892 counting only the distinct ones).

The product of its digits is 46080, while the sum is 37.

The square root of 28513684 is about 5339.8205962373. The cubic root of 28513684 is about 305.5046166006.

The spelling of 28513684 in words is "twenty-eight million, five hundred thirteen thousand, six hundred eighty-four".