64622591 has 12 divisors (see below), whose sum is σ = 74772600. Its totient is φ = 55653840.

The previous prime is 64622573. The next prime is 64622599. The reversal of 64622591 is 19522646.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-64622591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64622599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11756 + ... + 16353.

It is an arithmetic number, because the mean of its divisors is an integer number (6231050).

Almost surely, 2^64622591 is an apocalyptic number.

64622591 is a deficient number, since it is larger than the sum of its proper divisors (10150009).

64622591 is a wasteful number, since it uses less digits than its factorization.

64622591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28150 (or 28139 counting only the distinct ones).

The product of its digits is 25920, while the sum is 35.

The square root of 64622591 is about 8038.8177613378. The cubic root of 64622591 is about 401.2928812264.

The spelling of 64622591 in words is "sixty-four million, six hundred twenty-two thousand, five hundred ninety-one".