664033394 has 16 divisors (see below), whose sum is σ = 1061750400. Its totient is φ = 310559184.

The previous prime is 664033327. The next prime is 664033399. The reversal of 664033394 is 493330466.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is not an unprimeable number, because it can be changed into a prime (664033399) 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, 107597 + ... + 113600.

It is an arithmetic number, because the mean of its divisors is an integer number (66359400).

Almost surely, 2^664033394 is an apocalyptic number.

664033394 is a deficient number, since it is larger than the sum of its proper divisors (397717006).

664033394 is a wasteful number, since it uses less digits than its factorization.

664033394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221297.

The product of its (nonzero) digits is 139968, while the sum is 38.

The square root of 664033394 is about 25768.8454145699. The cubic root of 664033394 is about 872.4287592454.

The spelling of 664033394 in words is "six hundred sixty-four million, thirty-three thousand, three hundred ninety-four".