64586721 has 8 divisors (see below), whose sum is σ = 86495904. Its totient is φ = 42867680.

The previous prime is 64586707. The next prime is 64586759. The reversal of 64586721 is 12768546.

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

It is a cyclic number.

It is not a de Polignac number, because 64586721 - 2⁹ = 64586209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64586721.

It is not an unprimeable number, because it can be changed into a prime (64586021) 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, 46740 + ... + 48101.

It is an arithmetic number, because the mean of its divisors is an integer number (10811988).

Almost surely, 2^64586721 is an apocalyptic number.

It is an amenable number.

64586721 is a deficient number, since it is larger than the sum of its proper divisors (21909183).

64586721 is a wasteful number, since it uses less digits than its factorization.

64586721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95071.

The product of its digits is 80640, while the sum is 39.

The square root of 64586721 is about 8036.5864021984. The cubic root of 64586721 is about 401.2186190654.

The spelling of 64586721 in words is "sixty-four million, five hundred eighty-six thousand, seven hundred twenty-one".