664744968 has 48 divisors (see below), whose sum is σ = 1867036080. Its totient is φ = 221581008.

The previous prime is 664744957. The next prime is 664745063. The reversal of 664744968 is 869447466.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 169030 + ... + 172917.

It is an arithmetic number, because the mean of its divisors is an integer number (38896585).

Almost surely, 2^664744968 is an apocalyptic number.

It is an amenable number.

664744968 is an abundant number, since it is smaller than the sum of its proper divisors (1202291112).

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

664744968 is a wasteful number, since it uses less digits than its factorization.

664744968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341968 (or 341952 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 54.

The square root of 664744968 is about 25782.6485838829. The cubic root of 664744968 is about 872.7402777181.

It can be divided in two parts, 6647 and 44968, that added together give a palindrome (51615).

The spelling of 664744968 in words is "six hundred sixty-four million, seven hundred forty-four thousand, nine hundred sixty-eight".