664464892 has 72 divisors (see below), whose sum is σ = 1475597760. Its totient is φ = 259459200.

The previous prime is 664464863. The next prime is 664464919. The reversal of 664464892 is 298464466.

It is a Harshad number since it is a multiple of its sum of digits (49).

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, 199642 + ... + 202942.

Almost surely, 2^664464892 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 664464892, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (737798880).

664464892 is an abundant number, since it is smaller than the sum of its proper divisors (811132868).

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

664464892 is a wasteful number, since it uses less digits than its factorization.

664464892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3411 (or 3402 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 49.

The square root of 664464892 is about 25777.2165293307. The cubic root of 664464892 is about 872.6176903828.

The spelling of 664464892 in words is "six hundred sixty-four million, four hundred sixty-four thousand, eight hundred ninety-two".