668484992 has 128 divisors (see below), whose sum is σ = 1612154880. Its totient is φ = 270028800.

The previous prime is 668484991. The next prime is 668484997. The reversal of 668484992 is 299484866.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668484991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1138523 + ... + 1139109.

It is an arithmetic number, because the mean of its divisors is an integer number (12594960).

Almost surely, 2^668484992 is an apocalyptic number.

668484992 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668484992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (806077440).

668484992 is an abundant number, since it is smaller than the sum of its proper divisors (943669888).

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

668484992 is a wasteful number, since it uses less digits than its factorization.

668484992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680 (or 668 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 56.

The square root of 668484992 is about 25855.0767161886. The cubic root of 668484992 is about 874.3739704920.

The spelling of 668484992 in words is "six hundred sixty-eight million, four hundred eighty-four thousand, nine hundred ninety-two".