664499706 has 32 divisors (see below), whose sum is σ = 1515423168. Its totient is φ = 192433920.

The previous prime is 664499699. The next prime is 664499741. The reversal of 664499706 is 607994466.

It is a Harshad number since it is a multiple of its sum of digits (51).

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, 249240 + ... + 251891.

It is an arithmetic number, because the mean of its divisors is an integer number (47356974).

Almost surely, 2^664499706 is an apocalyptic number.

664499706 is an abundant number, since it is smaller than the sum of its proper divisors (850923462).

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

664499706 is a wasteful number, since it uses less digits than its factorization.

664499706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501166.

The product of its (nonzero) digits is 1959552, while the sum is 51.

The square root of 664499706 is about 25777.8918067401. The cubic root of 664499706 is about 872.6329301053.

The spelling of 664499706 in words is "six hundred sixty-four million, four hundred ninety-nine thousand, seven hundred six".