664040052 has 48 divisors (see below), whose sum is σ = 1854018880. Its totient is φ = 204319584.

The previous prime is 664040011. The next prime is 664040081. The reversal of 664040052 is 250040466.

It is a happy number.

664040052 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 664039998 and 664040025.

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, 235078 + ... + 237885.

Almost surely, 2^664040052 is an apocalyptic number.

It is an amenable number.

664040052 is an abundant number, since it is smaller than the sum of its proper divisors (1189978828).

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

664040052 is a wasteful number, since it uses less digits than its factorization.

664040052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472989 (or 472981 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 664040052 is about 25768.9746012526. The cubic root of 664040052 is about 872.4316750683.

The spelling of 664040052 in words is "six hundred sixty-four million, forty thousand, fifty-two".