668746748 has 12 divisors (see below), whose sum is σ = 1239148512. Its totient is φ = 314704320.

The previous prime is 668746709. The next prime is 668746751. The reversal of 668746748 is 847647866.

It is a junction number, because it is equal to n+sod(n) for n = 668746693 and 668746702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4917188 + ... + 4917323.

It is an arithmetic number, because the mean of its divisors is an integer number (103262376).

Almost surely, 2^668746748 is an apocalyptic number.

668746748 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

668746748 is a deficient number, since it is larger than the sum of its proper divisors (570401764).

668746748 is a wasteful number, since it uses less digits than its factorization.

668746748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9834532 (or 9834530 counting only the distinct ones).

The product of its digits is 10838016, while the sum is 56.

The square root of 668746748 is about 25860.1382053538. The cubic root of 668746748 is about 874.4880806413.

It can be divided in two parts, 6687 and 46748, that added together give a palindrome (53435).

The spelling of 668746748 in words is "six hundred sixty-eight million, seven hundred forty-six thousand, seven hundred forty-eight".