668452288 has 56 divisors (see below), whose sum is σ = 1518505472. Its totient is φ = 285997824.

The previous prime is 668452277. The next prime is 668452297. The reversal of 668452288 is 882254866.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-2 number, since 2×668452288² = 893656922664869888, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 432445 + ... + 433987.

Almost surely, 2^668452288 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 668452288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (759252736).

668452288 is an abundant number, since it is smaller than the sum of its proper divisors (850053184).

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

668452288 is a wasteful number, since it uses less digits than its factorization.

668452288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2529 (or 2519 counting only the distinct ones).

The product of its digits is 1474560, while the sum is 49.

The square root of 668452288 is about 25854.4442601267. Note that the first 3 decimals coincide. The cubic root of 668452288 is about 874.3597113872.

The spelling of 668452288 in words is "six hundred sixty-eight million, four hundred fifty-two thousand, two hundred eighty-eight".