668281724 has 24 divisors (see below), whose sum is σ = 1277262000. Its totient is φ = 303418880.

The previous prime is 668281723. The next prime is 668281741. The reversal of 668281724 is 427182866.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668281723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32702 + ... + 49050.

It is an arithmetic number, because the mean of its divisors is an integer number (53219250).

Almost surely, 2^668281724 is an apocalyptic number.

It is an amenable number.

668281724 is a deficient number, since it is larger than the sum of its proper divisors (608980276).

668281724 is a wasteful number, since it uses less digits than its factorization.

668281724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17293 (or 17291 counting only the distinct ones).

The product of its digits is 258048, while the sum is 44.

The square root of 668281724 is about 25851.1455065341. The cubic root of 668281724 is about 874.2853371056.

The spelling of 668281724 in words is "six hundred sixty-eight million, two hundred eighty-one thousand, seven hundred twenty-four".