664428366 has 128 divisors (see below), whose sum is σ = 1802649600. Its totient is φ = 177176160.

The previous prime is 664428353. The next prime is 664428379. The reversal of 664428366 is 663824466.

It is an interprime number because it is at equal distance from previous prime (664428353) and next prime (664428379).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 509271 + ... + 510573.

It is an arithmetic number, because the mean of its divisors is an integer number (14083200).

Almost surely, 2^664428366 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664428366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (901324800).

664428366 is an abundant number, since it is smaller than the sum of its proper divisors (1138221234).

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

664428366 is a wasteful number, since it uses less digits than its factorization.

664428366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1411 (or 1405 counting only the distinct ones).

The product of its digits is 995328, while the sum is 45.

The square root of 664428366 is about 25776.5080257199. The cubic root of 664428366 is about 872.6017006652.

The spelling of 664428366 in words is "six hundred sixty-four million, four hundred twenty-eight thousand, three hundred sixty-six".