668140338 has 32 divisors (see below), whose sum is σ = 1384608960. Its totient is φ = 214683840.

The previous prime is 668140337. The next prime is 668140349. The reversal of 668140338 is 833041866.

It is a super-2 number, since 2×668140338² = 892823022525508488, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 668140296 and 668140305.

It is not an unprimeable number, because it can be changed into a prime (668140337) 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, 117456 + ... + 123012.

It is an arithmetic number, because the mean of its divisors is an integer number (43269030).

Almost surely, 2^668140338 is an apocalyptic number.

668140338 is an abundant number, since it is smaller than the sum of its proper divisors (716468622).

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

668140338 is a wasteful number, since it uses less digits than its factorization.

668140338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6282.

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 668140338 is about 25848.4107441831. The cubic root of 668140338 is about 874.2236762718.

The spelling of 668140338 in words is "six hundred sixty-eight million, one hundred forty thousand, three hundred thirty-eight".