664804139 has 8 divisors (see below), whose sum is σ = 670505472. Its totient is φ = 659122920.

The previous prime is 664804117. The next prime is 664804157. The reversal of 664804139 is 931408466.

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

It is a cyclic number.

It is not a de Polignac number, because 664804139 - 2¹² = 664800043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664804096 and 664804105.

It is not an unprimeable number, because it can be changed into a prime (664801139) 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, 65522 + ... + 74984.

It is an arithmetic number, because the mean of its divisors is an integer number (83813184).

Almost surely, 2^664804139 is an apocalyptic number.

664804139 is a deficient number, since it is larger than the sum of its proper divisors (5701333).

664804139 is a wasteful number, since it uses less digits than its factorization.

664804139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10057.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 664804139 is about 25783.7960548869. The cubic root of 664804139 is about 872.7661720512.

The spelling of 664804139 in words is "six hundred sixty-four million, eight hundred four thousand, one hundred thirty-nine".