664123340 has 96 divisors (see below), whose sum is σ = 1510488000. Its totient is φ = 244518912.

The previous prime is 664123331. The next prime is 664123357. The reversal of 664123340 is 43321466.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2468726 + ... + 2468994.

It is an arithmetic number, because the mean of its divisors is an integer number (15734250).

Almost surely, 2^664123340 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 664123340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (755244000).

664123340 is an abundant number, since it is smaller than the sum of its proper divisors (846364660).

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

664123340 is a wasteful number, since it uses less digits than its factorization.

664123340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459 (or 457 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 664123340 is about 25770.5906024678. The cubic root of 664123340 is about 872.4681487977.

The spelling of 664123340 in words is "six hundred sixty-four million, one hundred twenty-three thousand, three hundred forty".