28561136 has 10 divisors (see below), whose sum is σ = 55337232. Its totient is φ = 14280560.

The previous prime is 28561111. The next prime is 28561153. The reversal of 28561136 is 63116582.

It is a happy number.

It is a super-2 number, since 2×28561136² = 1631476979220992, which contains 22 as substring.

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, 892520 + ... + 892551.

Almost surely, 2^28561136 is an apocalyptic number.

It is an amenable number.

28561136 is a deficient number, since it is larger than the sum of its proper divisors (26776096).

28561136 is a wasteful number, since it uses less digits than its factorization.

28561136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1785079 (or 1785073 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 28561136 is about 5344.2619696269. The cubic root of 28561136 is about 305.6739945820.

The spelling of 28561136 in words is "twenty-eight million, five hundred sixty-one thousand, one hundred thirty-six".