668295678 has 16 divisors (see below), whose sum is σ = 1349084160. Its totient is φ = 220683096.

The previous prime is 668295671. The next prime is 668295697. The reversal of 668295678 is 876592866.

It is a super-2 number, since 2×668295678² = 893238226466959368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668295671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 519838 + ... + 521121.

It is an arithmetic number, because the mean of its divisors is an integer number (84317760).

Almost surely, 2^668295678 is an apocalyptic number.

668295678 is an abundant number, since it is smaller than the sum of its proper divisors (680788482).

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

668295678 is a wasteful number, since it uses less digits than its factorization.

668295678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041071.

The product of its digits is 8709120, while the sum is 57.

The square root of 668295678 is about 25851.4153964536. The cubic root of 668295678 is about 874.2914222103.

The spelling of 668295678 in words is "six hundred sixty-eight million, two hundred ninety-five thousand, six hundred seventy-eight".