668042424 has 64 divisors (see below), whose sum is σ = 2120774400. Its totient is φ = 190868832.

The previous prime is 668042423. The next prime is 668042449. The reversal of 668042424 is 424240866.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668042423) 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, 219402 + ... + 222425.

It is an arithmetic number, because the mean of its divisors is an integer number (33137100).

Almost surely, 2^668042424 is an apocalyptic number.

It is an amenable number.

668042424 is an abundant number, since it is smaller than the sum of its proper divisors (1452731976).

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

668042424 is a wasteful number, since it uses less digits than its factorization.

668042424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441849 (or 441839 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 36.

The square root of 668042424 is about 25846.5166705303. The cubic root of 668042424 is about 874.1809692166.

The spelling of 668042424 in words is "six hundred sixty-eight million, forty-two thousand, four hundred twenty-four".