64518939 has 24 divisors (see below), whose sum is σ = 97016400. Its totient is φ = 41267520.

The previous prime is 64518899. The next prime is 64518943. The reversal of 64518939 is 93981546.

It is a happy number.

It is not a de Polignac number, because 64518939 - 2¹¹ = 64516891 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64518894 and 64518903.

It is not an unprimeable number, because it can be changed into a prime (64518959) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46029 + ... + 47409.

It is an arithmetic number, because the mean of its divisors is an integer number (4042350).

Almost surely, 2^64518939 is an apocalyptic number.

64518939 is a deficient number, since it is larger than the sum of its proper divisors (32497461).

64518939 is a wasteful number, since it uses less digits than its factorization.

64518939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1595 (or 1592 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 64518939 is about 8032.3682062017. The cubic root of 64518939 is about 401.0782139420.

The spelling of 64518939 in words is "sixty-four million, five hundred eighteen thousand, nine hundred thirty-nine".