36864721 has 8 divisors (see below), whose sum is σ = 39088224. Its totient is φ = 34647360.

The previous prime is 36864689. The next prime is 36864727. The reversal of 36864721 is 12746863.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 36864721 - 2⁵ = 36864689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36864727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18126 + ... + 20056.

It is an arithmetic number, because the mean of its divisors is an integer number (4886028).

Almost surely, 2^36864721 is an apocalyptic number.

It is an amenable number.

36864721 is a deficient number, since it is larger than the sum of its proper divisors (2223503).

36864721 is a wasteful number, since it uses less digits than its factorization.

36864721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3071.

The product of its digits is 48384, while the sum is 37.

The square root of 36864721 is about 6071.6324822901. The cubic root of 36864721 is about 332.8155814375.

The spelling of 36864721 in words is "thirty-six million, eight hundred sixty-four thousand, seven hundred twenty-one".