28131536 has 10 divisors (see below), whose sum is σ = 54504882. Its totient is φ = 14065760.

The previous prime is 28131527. The next prime is 28131541. The reversal of 28131536 is 63513182.

It can be written as a sum of positive squares in only one way, i.e., 25441936 + 2689600 = 5044^2 + 1640^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28131499 and 28131508.

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, 879095 + ... + 879126.

Almost surely, 2^28131536 is an apocalyptic number.

It is an amenable number.

28131536 is a deficient number, since it is larger than the sum of its proper divisors (26373346).

28131536 is a wasteful number, since it uses less digits than its factorization.

28131536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1758229 (or 1758223 counting only the distinct ones).

The product of its digits is 4320, while the sum is 29.

The square root of 28131536 is about 5303.9170430918. The cubic root of 28131536 is about 304.1336554487.

The spelling of 28131536 in words is "twenty-eight million, one hundred thirty-one thousand, five hundred thirty-six".