668276568 has 40 divisors (see below), whose sum is σ = 1871794980. Its totient is φ = 222758640.

The previous prime is 668276561. The next prime is 668276591. The reversal of 668276568 is 865672866.

668276568 is a `hidden beast` number, since 6 + 6 + 8 + 2 + 76 + 568 = 666.

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 (668276561) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 514998 + ... + 516293.

Almost surely, 2^668276568 is an apocalyptic number.

It is an amenable number.

668276568 is an abundant number, since it is smaller than the sum of its proper divisors (1203518412).

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

668276568 is a wasteful number, since it uses less digits than its factorization.

668276568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1031309 (or 1031296 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The square root of 668276568 is about 25851.0457815540. The cubic root of 668276568 is about 874.2830886393.

The spelling of 668276568 in words is "six hundred sixty-eight million, two hundred seventy-six thousand, five hundred sixty-eight".