664464024 has 96 divisors (see below), whose sum is σ = 2070531840. Its totient is φ = 188568000.

The previous prime is 664464011. The next prime is 664464049. The reversal of 664464024 is 420464466.

It is a happy number.

664464024 is a `hidden beast` number, since 6 + 6 + 4 + 4 + 640 + 2 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 664464024.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 71739 + ... + 80469.

It is an arithmetic number, because the mean of its divisors is an integer number (21568040).

Almost surely, 2^664464024 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 664464024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1035265920).

664464024 is an abundant number, since it is smaller than the sum of its proper divisors (1406067816).

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

664464024 is a wasteful number, since it uses less digits than its factorization.

664464024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8901 (or 8894 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 36.

The square root of 664464024 is about 25777.1996927517. The cubic root of 664464024 is about 872.6173104116.

The spelling of 664464024 in words is "six hundred sixty-four million, four hundred sixty-four thousand, twenty-four".