664291072 has 36 divisors (see below), whose sum is σ = 1395786280. Its totient is φ = 314661888.

The previous prime is 664291057. The next prime is 664291073. The reversal of 664291072 is 270192466.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664291073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63423 + ... + 73150.

Almost surely, 2^664291072 is an apocalyptic number.

It is an amenable number.

664291072 is an abundant number, since it is smaller than the sum of its proper divisors (731495208).

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

664291072 is a wasteful number, since it uses less digits than its factorization.

664291072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136608 (or 136594 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 664291072 is about 25773.8447267768. The cubic root of 664291072 is about 872.5415932422.

The spelling of 664291072 in words is "six hundred sixty-four million, two hundred ninety-one thousand, seventy-two".