28656036 has 18 divisors (see below), whose sum is σ = 72436182. Its totient is φ = 9552000.

The previous prime is 28656013. The next prime is 28656049. The reversal of 28656036 is 63065682.

It can be written as a sum of positive squares in only one way, i.e., 22184100 + 6471936 = 4710^2 + 2544^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 796001 = 28656036 / (2 + 8 + 6 + 5 + 6 + 0 + 3 + 6).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 397965 + ... + 398036.

Almost surely, 2^28656036 is an apocalyptic number.

It is an amenable number.

28656036 is an abundant number, since it is smaller than the sum of its proper divisors (43780146).

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

28656036 is a wasteful number, since it uses less digits than its factorization.

28656036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796011 (or 796006 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 28656036 is about 5353.1332880847. The cubic root of 28656036 is about 306.0121743202.

The spelling of 28656036 in words is "twenty-eight million, six hundred fifty-six thousand, thirty-six".