664458876 has 120 divisors (see below), whose sum is σ = 1826877360. Its totient is φ = 210325248.

The previous prime is 664458869. The next prime is 664458943. The reversal of 664458876 is 678854466.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 514840 + ... + 516128.

It is an arithmetic number, because the mean of its divisors is an integer number (15223978).

Almost surely, 2^664458876 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664458876, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (913438680).

664458876 is an abundant number, since it is smaller than the sum of its proper divisors (1162418484).

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

664458876 is a wasteful number, since it uses less digits than its factorization.

664458876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1385 (or 1374 counting only the distinct ones).

The product of its digits is 7741440, while the sum is 54.

The square root of 664458876 is about 25777.0998368707. The cubic root of 664458876 is about 872.6150568431.

The spelling of 664458876 in words is "six hundred sixty-four million, four hundred fifty-eight thousand, eight hundred seventy-six".