664434367 has 4 divisors (see below), whose sum is σ = 665705320. Its totient is φ = 663163416.

The previous prime is 664434301. The next prime is 664434391. The reversal of 664434367 is 763434466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664434367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664434467) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 634692 + ... + 635737.

It is an arithmetic number, because the mean of its divisors is an integer number (166426330).

Almost surely, 2^664434367 is an apocalyptic number.

664434367 is a deficient number, since it is larger than the sum of its proper divisors (1270953).

664434367 is a wasteful number, since it uses less digits than its factorization.

664434367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1270952.

The product of its digits is 870912, while the sum is 43.

The square root of 664434367 is about 25776.6244298977. The cubic root of 664434367 is about 872.6043277189.

Subtracting 664434367 from its reverse (763434466), we obtain a palindrome (99000099).

The spelling of 664434367 in words is "six hundred sixty-four million, four hundred thirty-four thousand, three hundred sixty-seven".