664434684 has 48 divisors (see below), whose sum is σ = 1764635040. Its totient is φ = 216074880.

The previous prime is 664434677. The next prime is 664434703. The reversal of 664434684 is 486434466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70599 + ... + 79454.

It is an arithmetic number, because the mean of its divisors is an integer number (36763230).

Almost surely, 2^664434684 is an apocalyptic number.

It is an amenable number.

664434684 is an abundant number, since it is smaller than the sum of its proper divisors (1100200356).

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

664434684 is a wasteful number, since it uses less digits than its factorization.

664434684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150107 (or 150099 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 45.

The square root of 664434684 is about 25776.6305788790. The cubic root of 664434684 is about 872.6044664914.

It can be divided in two parts, 6644 and 34684, that added together give a triangular number (41328 = T₂₈₇).

The spelling of 664434684 in words is "six hundred sixty-four million, four hundred thirty-four thousand, six hundred eighty-four".