36616721 has 4 divisors (see below), whose sum is σ = 36633012. Its totient is φ = 36600432.

The previous prime is 36616709. The next prime is 36616747. The reversal of 36616721 is 12761663.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8410000 + 28206721 = 2900^2 + 5311^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-36616721 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (36618721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4106 + ... + 9491.

It is an arithmetic number, because the mean of its divisors is an integer number (9158253).

Almost surely, 2^36616721 is an apocalyptic number.

It is an amenable number.

36616721 is a deficient number, since it is larger than the sum of its proper divisors (16291).

36616721 is a wasteful number, since it uses less digits than its factorization.

36616721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16290.

The product of its digits is 9072, while the sum is 32.

The square root of 36616721 is about 6051.1751751209. The cubic root of 36616721 is about 332.0675849489.

The spelling of 36616721 in words is "thirty-six million, six hundred sixteen thousand, seven hundred twenty-one".