28013656 has 16 divisors (see below), whose sum is σ = 57300840. Its totient is φ = 12733440.

The previous prime is 28013653. The next prime is 28013693. The reversal of 28013656 is 65631082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28013653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159081 + ... + 159256.

Almost surely, 2^28013656 is an apocalyptic number.

It is an amenable number.

28013656 is an abundant number, since it is smaller than the sum of its proper divisors (29287184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28013656 is a wasteful number, since it uses less digits than its factorization.

28013656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318354 (or 318350 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 28013656 is about 5292.7928355453. The cubic root of 28013656 is about 303.7082554249.

The spelling of 28013656 in words is "twenty-eight million, thirteen thousand, six hundred fifty-six".