664471892 has 12 divisors (see below), whose sum is σ = 1328943840. Its totient is φ = 284773656.

The previous prime is 664471891. The next prime is 664471901. The reversal of 664471892 is 298174466.

664471892 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664471891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11865542 + ... + 11865597.

It is an arithmetic number, because the mean of its divisors is an integer number (110745320).

Almost surely, 2^664471892 is an apocalyptic number.

It is an amenable number.

664471892 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

664471892 is a wasteful number, since it uses less digits than its factorization.

664471892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23731150 (or 23731148 counting only the distinct ones).

The product of its digits is 580608, while the sum is 47.

The square root of 664471892 is about 25777.3523077914. The cubic root of 664471892 is about 872.6207546542.

The spelling of 664471892 in words is "six hundred sixty-four million, four hundred seventy-one thousand, eight hundred ninety-two".