664734670 has 16 divisors (see below), whose sum is σ = 1197480960. Its totient is φ = 265680864.

The previous prime is 664734659. The next prime is 664734673. The reversal of 664734670 is 76437466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664734673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13197 + ... + 38776.

It is an arithmetic number, because the mean of its divisors is an integer number (74842560).

Almost surely, 2^664734670 is an apocalyptic number.

664734670 is a deficient number, since it is larger than the sum of its proper divisors (532746290).

664734670 is a wasteful number, since it uses less digits than its factorization.

664734670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53259.

The product of its (nonzero) digits is 508032, while the sum is 43.

The square root of 664734670 is about 25782.4488751554. The cubic root of 664734670 is about 872.7357709643.

The spelling of 664734670 in words is "six hundred sixty-four million, seven hundred thirty-four thousand, six hundred seventy".