664989192 has 96 divisors (see below), whose sum is σ = 2100384000. Its totient is φ = 189989856.

The previous prime is 664989181. The next prime is 664989211. The reversal of 664989192 is 291989466.

664989192 is a `hidden beast` number, since 66 + 498 + 9 + 1 + 92 = 666.

It is a nude number because it is divisible by every one of its digits.

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, 11233 + ... + 38159.

It is an arithmetic number, because the mean of its divisors is an integer number (21879000).

Almost surely, 2^664989192 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 664989192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1050192000).

664989192 is an abundant number, since it is smaller than the sum of its proper divisors (1435394808).

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

664989192 is a wasteful number, since it uses less digits than its factorization.

664989192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26960 (or 26939 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 54.

The square root of 664989192 is about 25787.3843574722. The cubic root of 664989192 is about 872.8471447797.

The spelling of 664989192 in words is "six hundred sixty-four million, nine hundred eighty-nine thousand, one hundred ninety-two".