64563609 has 16 divisors (see below), whose sum is σ = 95200704. Its totient is φ = 38592000.

The previous prime is 64563547. The next prime is 64563647. The reversal of 64563609 is 90636546.

It is a happy number.

It is not a de Polignac number, because 64563609 - 2⁹ = 64563097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64563209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10992 + ... + 15809.

It is an arithmetic number, because the mean of its divisors is an integer number (5950044).

Almost surely, 2^64563609 is an apocalyptic number.

It is an amenable number.

64563609 is a deficient number, since it is larger than the sum of its proper divisors (30637095).

64563609 is a wasteful number, since it uses less digits than its factorization.

64563609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26888.

The product of its (nonzero) digits is 116640, while the sum is 39.

The square root of 64563609 is about 8035.1483495950. The cubic root of 64563609 is about 401.1707554030.

The spelling of 64563609 in words is "sixty-four million, five hundred sixty-three thousand, six hundred nine".