28136884 has 6 divisors (see below), whose sum is σ = 49239554. Its totient is φ = 14068440.

The previous prime is 28136863. The next prime is 28136903. The reversal of 28136884 is 48863182.

It can be written as a sum of positive squares in only one way, i.e., 25280784 + 2856100 = 5028^2 + 1690^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3517107 + ... + 3517114.

Almost surely, 2^28136884 is an apocalyptic number.

It is an amenable number.

28136884 is a deficient number, since it is larger than the sum of its proper divisors (21102670).

28136884 is a wasteful number, since it uses less digits than its factorization.

28136884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7034225 (or 7034223 counting only the distinct ones).

The product of its digits is 73728, while the sum is 40.

The square root of 28136884 is about 5304.4211748314. The cubic root of 28136884 is about 304.1529268663.

The spelling of 28136884 in words is "twenty-eight million, one hundred thirty-six thousand, eight hundred eighty-four".