28812136 has 8 divisors (see below), whose sum is σ = 54022770. Its totient is φ = 14406064.

The previous prime is 28812101. The next prime is 28812137. The reversal of 28812136 is 63121882.

It can be written as a sum of positive squares in only one way, i.e., 17589636 + 11222500 = 4194^2 + 3350^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 28812098 and 28812107.

It is not an unprimeable number, because it can be changed into a prime (28812137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1800751 + ... + 1800766.

Almost surely, 2^28812136 is an apocalyptic number.

It is an amenable number.

28812136 is a deficient number, since it is larger than the sum of its proper divisors (25210634).

28812136 is a wasteful number, since it uses less digits than its factorization.

28812136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3601523 (or 3601519 counting only the distinct ones).

The product of its digits is 4608, while the sum is 31.

The square root of 28812136 is about 5367.6937319486. The cubic root of 28812136 is about 306.5668221485.

The spelling of 28812136 in words is "twenty-eight million, eight hundred twelve thousand, one hundred thirty-six".