64724621 has 32 divisors (see below), whose sum is σ = 77414400. Its totient is φ = 53576640.

The previous prime is 64724587. The next prime is 64724623. The reversal of 64724621 is 12642746.

It is a de Polignac number, because none of the positive numbers 2^k-64724621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64724623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 604850 + ... + 604956.

It is an arithmetic number, because the mean of its divisors is an integer number (2419200).

Almost surely, 2^64724621 is an apocalyptic number.

It is an amenable number.

64724621 is a deficient number, since it is larger than the sum of its proper divisors (12689779).

64724621 is a wasteful number, since it uses less digits than its factorization.

64724621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249.

The product of its digits is 16128, while the sum is 32.

The square root of 64724621 is about 8045.1613408309. The cubic root of 64724621 is about 401.5039652177.

The spelling of 64724621 in words is "sixty-four million, seven hundred twenty-four thousand, six hundred twenty-one".