64564590 has 16 divisors (see below), whose sum is σ = 154955088. Its totient is φ = 17217216.

The previous prime is 64564579. The next prime is 64564597. The reversal of 64564590 is 9546546.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64564597) 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, 1076047 + ... + 1076106.

It is an arithmetic number, because the mean of its divisors is an integer number (9684693).

Almost surely, 2^64564590 is an apocalyptic number.

64564590 is an abundant number, since it is smaller than the sum of its proper divisors (90390498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64564590 is a wasteful number, since it uses less digits than its factorization.

64564590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2152163.

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 64564590 is about 8035.2093936624. The cubic root of 64564590 is about 401.1727872313.

The spelling of 64564590 in words is "sixty-four million, five hundred sixty-four thousand, five hundred ninety".