664364442 has 48 divisors (see below), whose sum is σ = 1549456992. Its totient is φ = 189352800.

The previous prime is 664364423. The next prime is 664364473. The reversal of 664364442 is 244463466.

It is a super-2 number, since 2×664364442² = 882760223587942728, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 664364442.

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, 127692 + ... + 132792.

It is an arithmetic number, because the mean of its divisors is an integer number (32280354).

Almost surely, 2^664364442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664364442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (774728496).

664364442 is an abundant number, since it is smaller than the sum of its proper divisors (885092550).

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

664364442 is a wasteful number, since it uses less digits than its factorization.

664364442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5563 (or 5556 counting only the distinct ones).

The product of its digits is 331776, while the sum is 39.

The square root of 664364442 is about 25775.2680296442. The cubic root of 664364442 is about 872.5737157171.

The spelling of 664364442 in words is "six hundred sixty-four million, three hundred sixty-four thousand, four hundred forty-two".