64564505 has 4 divisors (see below), whose sum is σ = 77477412. Its totient is φ = 51651600.

The previous prime is 64564501. The next prime is 64564517. The reversal of 64564505 is 50546546.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12306064 + 52258441 = 3508^2 + 7229^2 .

It is not a de Polignac number, because 64564505 - 2² = 64564501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64564501) 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, 6456446 + ... + 6456455.

It is an arithmetic number, because the mean of its divisors is an integer number (19369353).

Almost surely, 2^64564505 is an apocalyptic number.

It is an amenable number.

64564505 is a deficient number, since it is larger than the sum of its proper divisors (12912907).

64564505 is a wasteful number, since it uses less digits than its factorization.

64564505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12912906.

The product of its (nonzero) digits is 72000, while the sum is 35.

The square root of 64564505 is about 8035.2041044394. The cubic root of 64564505 is about 401.1726111818.

The spelling of 64564505 in words is "sixty-four million, five hundred sixty-four thousand, five hundred five".