668146740 has 48 divisors (see below), whose sum is σ = 1921379712. Its totient is φ = 173356416.

The previous prime is 668146691. The next prime is 668146753. The reversal of 668146740 is 47641866.

668146740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 668146692 and 668146701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148264 + ... + 152703.

It is an arithmetic number, because the mean of its divisors is an integer number (40028744).

Almost surely, 2^668146740 is an apocalyptic number.

668146740 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

668146740 is an abundant number, since it is smaller than the sum of its proper divisors (1253232972).

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

668146740 is a wasteful number, since it uses less digits than its factorization.

668146740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301016 (or 301014 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 42.

The square root of 668146740 is about 25848.5345812872. The cubic root of 668146740 is about 874.2264684806.

The spelling of 668146740 in words is "six hundred sixty-eight million, one hundred forty-six thousand, seven hundred forty".