664507407 has 16 divisors (see below), whose sum is σ = 952134912. Its totient is φ = 410720640.

The previous prime is 664507399. The next prime is 664507427. The reversal of 664507407 is 704705466.

It is not a de Polignac number, because 664507407 - 2³ = 664507399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664507427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93819 + ... + 100652.

It is an arithmetic number, because the mean of its divisors is an integer number (59508432).

Almost surely, 2^664507407 is an apocalyptic number.

664507407 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

664507407 is a deficient number, since it is larger than the sum of its proper divisors (287627505).

664507407 is a wasteful number, since it uses less digits than its factorization.

664507407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194558.

The product of its (nonzero) digits is 141120, while the sum is 39.

The square root of 664507407 is about 25778.0411784914. The cubic root of 664507407 is about 872.6363011227.

The spelling of 664507407 in words is "six hundred sixty-four million, five hundred seven thousand, four hundred seven".