664693884 has 48 divisors (see below), whose sum is σ = 1726734240. Its totient is φ = 221120640.

The previous prime is 664693879. The next prime is 664693907. The reversal of 664693884 is 488396466.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 664693884.

It is a congruent number.

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, 50362 + ... + 62174.

It is an arithmetic number, because the mean of its divisors is an integer number (35973630).

Almost surely, 2^664693884 is an apocalyptic number.

It is an amenable number.

664693884 is an abundant number, since it is smaller than the sum of its proper divisors (1062040356).

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

664693884 is a wasteful number, since it uses less digits than its factorization.

664693884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12347 (or 12339 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 54.

The square root of 664693884 is about 25781.6578985914. The cubic root of 664693884 is about 872.7179211711.

The spelling of 664693884 in words is "six hundred sixty-four million, six hundred ninety-three thousand, eight hundred eighty-four".