64563473 has 4 divisors (see below), whose sum is σ = 69529908. Its totient is φ = 59597040.

The previous prime is 64563469. The next prime is 64563509. The reversal of 64563473 is 37436546.

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 3598609 + 60964864 = 1897^2 + 7808^2 .

It is a cyclic number.

It is not a de Polignac number, because 64563473 - 2² = 64563469 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64563413) 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, 2483198 + ... + 2483223.

It is an arithmetic number, because the mean of its divisors is an integer number (17382477).

Almost surely, 2^64563473 is an apocalyptic number.

It is an amenable number.

64563473 is a deficient number, since it is larger than the sum of its proper divisors (4966435).

64563473 is a wasteful number, since it uses less digits than its factorization.

64563473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4966434.

The product of its digits is 181440, while the sum is 38.

The square root of 64563473 is about 8035.1398867724. The cubic root of 64563473 is about 401.1704737208.

The spelling of 64563473 in words is "sixty-four million, five hundred sixty-three thousand, four hundred seventy-three".