664023239 has 8 divisors (see below), whose sum is σ = 726122880. Its totient is φ = 602212600.

The previous prime is 664023221. The next prime is 664023251. The reversal of 664023239 is 932320466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-664023239 is a prime.

It is a super-2 number, since 2×664023239² = 881853723864102242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664023199 and 664023208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664023209) 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, 67427 + ... + 76644.

It is an arithmetic number, because the mean of its divisors is an integer number (90765360).

Almost surely, 2^664023239 is an apocalyptic number.

664023239 is a deficient number, since it is larger than the sum of its proper divisors (62099641).

664023239 is a wasteful number, since it uses less digits than its factorization.

664023239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144501.

The product of its (nonzero) digits is 46656, while the sum is 35.

The square root of 664023239 is about 25768.6483735566. The cubic root of 664023239 is about 872.4243118992.

The spelling of 664023239 in words is "six hundred sixty-four million, twenty-three thousand, two hundred thirty-nine".