664400235 has 16 divisors (see below), whose sum is σ = 1072795680. Its totient is φ = 351095040.

The previous prime is 664400221. The next prime is 664400249. The reversal of 664400235 is 532004466.

It is an interprime number because it is at equal distance from previous prime (664400221) and next prime (664400249).

It is not a de Polignac number, because 664400235 - 2¹¹ = 664398187 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201546 + ... + 204815.

It is an arithmetic number, because the mean of its divisors is an integer number (67049730).

Almost surely, 2^664400235 is an apocalyptic number.

664400235 is a deficient number, since it is larger than the sum of its proper divisors (408395445).

664400235 is a wasteful number, since it uses less digits than its factorization.

664400235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406478.

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 664400235 is about 25775.9623486690. The cubic root of 664400235 is about 872.5893855654.

The spelling of 664400235 in words is "six hundred sixty-four million, four hundred thousand, two hundred thirty-five".