64652591 has 4 divisors (see below), whose sum is σ = 64690752. Its totient is φ = 64614432.

The previous prime is 64652557. The next prime is 64652593. The reversal of 64652591 is 19525646.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64652591 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 (64652593) 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, 16415 + ... + 19968.

It is an arithmetic number, because the mean of its divisors is an integer number (16172688).

Almost surely, 2^64652591 is an apocalyptic number.

64652591 is a deficient number, since it is larger than the sum of its proper divisors (38161).

64652591 is a wasteful number, since it uses less digits than its factorization.

64652591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38160.

The product of its digits is 64800, while the sum is 38.

The square root of 64652591 is about 8040.6834908483. The cubic root of 64652591 is about 401.3549695446.

The spelling of 64652591 in words is "sixty-four million, six hundred fifty-two thousand, five hundred ninety-one".