664309074 has 64 divisors (see below), whose sum is σ = 1564738560. Its totient is φ = 185363520.

The previous prime is 664309057. The next prime is 664309099. The reversal of 664309074 is 470903466.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 502987 + ... + 504305.

It is an arithmetic number, because the mean of its divisors is an integer number (24449040).

Almost surely, 2^664309074 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664309074, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (782369280).

664309074 is an abundant number, since it is smaller than the sum of its proper divisors (900429486).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664309074 is a wasteful number, since it uses less digits than its factorization.

664309074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1935.

The product of its (nonzero) digits is 108864, while the sum is 39.

The square root of 664309074 is about 25774.1939544188. The cubic root of 664309074 is about 872.5494750039.

The spelling of 664309074 in words is "six hundred sixty-four million, three hundred nine thousand, seventy-four".