6664392 has 72 divisors (see below), whose sum is σ = 21007350. Its totient is φ = 1903104.

The previous prime is 6664387. The next prime is 6664417. The reversal of 6664392 is 2934666.

It can be written as a sum of positive squares in only one way, i.e., 5731236 + 933156 = 2394^2 + 966^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2584 + ... + 4472.

Almost surely, 2^6664392 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6664392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10503675).

6664392 is an abundant number, since it is smaller than the sum of its proper divisors (14342958).

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

6664392 is a wasteful number, since it uses less digits than its factorization.

6664392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1915 (or 1901 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

The square root of 6664392 is about 2581.5483725857. The cubic root of 6664392 is about 188.1857979084.

It can be divided in two parts, 6664 and 392, that added together give a square (7056 = 84²).

The spelling of 6664392 in words is "six million, six hundred sixty-four thousand, three hundred ninety-two".