36656721 has 12 divisors (see below), whose sum is σ = 53125072. Its totient is φ = 24356376.

The previous prime is 36656713. The next prime is 36656723. The reversal of 36656721 is 12765663.

36656721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 36656721 - 2³ = 36656713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36656723) 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 11 ways as a sum of consecutive naturals, for example, 3871 + ... + 9396.

Almost surely, 2^36656721 is an apocalyptic number.

It is an amenable number.

36656721 is a deficient number, since it is larger than the sum of its proper divisors (16468351).

36656721 is a wasteful number, since it uses less digits than its factorization.

36656721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13580 (or 13577 counting only the distinct ones).

The product of its digits is 45360, while the sum is 36.

The square root of 36656721 is about 6054.4794161018. The cubic root of 36656721 is about 332.1884575021.

The spelling of 36656721 in words is "thirty-six million, six hundred fifty-six thousand, seven hundred twenty-one".