64639488 has 40 divisors (see below), whose sum is σ = 172207728. Its totient is φ = 21545984.

The previous prime is 64639469. The next prime is 64639511. The reversal of 64639488 is 88493646.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19506 + ... + 22577.

Almost surely, 2^64639488 is an apocalyptic number.

It is an amenable number.

64639488 is an abundant number, since it is smaller than the sum of its proper divisors (107568240).

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

64639488 is an equidigital number, since it uses as much as digits as its factorization.

64639488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42104 (or 42088 counting only the distinct ones).

The product of its digits is 995328, while the sum is 48.

The square root of 64639488 is about 8039.8686556436. The cubic root of 64639488 is about 401.3278537997.

It can be divided in two parts, 6463 and 9488, that added together give a palindrome (15951).

The spelling of 64639488 in words is "sixty-four million, six hundred thirty-nine thousand, four hundred eighty-eight".