664277690 has 16 divisors (see below), whose sum is σ = 1203621120. Its totient is φ = 263950800.

The previous prime is 664277681. The next prime is 664277701. The reversal of 664277690 is 96772466.

It is a super-2 number, since 2×664277690² = 882529698863472200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218450 + ... + 221469.

It is an arithmetic number, because the mean of its divisors is an integer number (75226320).

Almost surely, 2^664277690 is an apocalyptic number.

664277690 is a deficient number, since it is larger than the sum of its proper divisors (539343430).

664277690 is a wasteful number, since it uses less digits than its factorization.

664277690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440077.

The product of its (nonzero) digits is 762048, while the sum is 47.

The square root of 664277690 is about 25773.5851212050. The cubic root of 664277690 is about 872.5357341489.

The spelling of 664277690 in words is "six hundred sixty-four million, two hundred seventy-seven thousand, six hundred ninety".