668081740 has 24 divisors (see below), whose sum is σ = 1403544240. Its totient is φ = 267123648.

The previous prime is 668081717. The next prime is 668081761. The reversal of 668081740 is 47180866.

668081740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×668081740² = 892666422642855200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 668081693 and 668081702.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58846 + ... + 69274.

It is an arithmetic number, because the mean of its divisors is an integer number (58481010).

Almost surely, 2^668081740 is an apocalyptic number.

It is an amenable number.

668081740 is an abundant number, since it is smaller than the sum of its proper divisors (735462500).

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

668081740 is a wasteful number, since it uses less digits than its factorization.

668081740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13641 (or 13639 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 668081740 is about 25847.2772260445. The cubic root of 668081740 is about 874.1981181399.

The spelling of 668081740 in words is "six hundred sixty-eight million, eighty-one thousand, seven hundred forty".