664073775 has 24 divisors (see below), whose sum is σ = 1219929360. Its totient is φ = 354172320.

The previous prime is 664073749. The next prime is 664073789. The reversal of 664073775 is 577370466.

It is not a de Polignac number, because 664073775 - 2¹³ = 664065583 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 664073775.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 491232 + ... + 492581.

It is an arithmetic number, because the mean of its divisors is an integer number (50830390).

Almost surely, 2^664073775 is an apocalyptic number.

664073775 is a deficient number, since it is larger than the sum of its proper divisors (555855585).

664073775 is a wasteful number, since it uses less digits than its factorization.

664073775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 983832 (or 983821 counting only the distinct ones).

The product of its (nonzero) digits is 740880, while the sum is 45.

The square root of 664073775 is about 25769.6289263156. The cubic root of 664073775 is about 872.4464435125.

The spelling of 664073775 in words is "six hundred sixty-four million, seventy-three thousand, seven hundred seventy-five".