668527992 has 224 divisors, whose sum is σ = 2174370480. Its totient is φ = 190356480.

The previous prime is 668527973. The next prime is 668527999. The reversal of 668527992 is 299725866.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668527999) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 1090278 + ... + 1090890.

Almost surely, 2^668527992 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 668527992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1087185240).

668527992 is an abundant number, since it is smaller than the sum of its proper divisors (1505842488).

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

668527992 is a wasteful number, since it uses less digits than its factorization.

668527992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665 (or 646 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The square root of 668527992 is about 25855.9082609759. The cubic root of 668527992 is about 874.3927179957.

The spelling of 668527992 in words is "six hundred sixty-eight million, five hundred twenty-seven thousand, nine hundred ninety-two".