668912280 has 64 divisors (see below), whose sum is σ = 2011426560. Its totient is φ = 177959808.

The previous prime is 668912269. The next prime is 668912287. The reversal of 668912280 is 82219866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668912287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46869 + ... + 59451.

It is an arithmetic number, because the mean of its divisors is an integer number (31428540).

Almost surely, 2^668912280 is an apocalyptic number.

668912280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

668912280 is an abundant number, since it is smaller than the sum of its proper divisors (1342514280).

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

668912280 is a wasteful number, since it uses less digits than its factorization.

668912280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13040 (or 13036 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 668912280 is about 25863.3385315972. The cubic root of 668912280 is about 874.5602274439.

The spelling of 668912280 in words is "six hundred sixty-eight million, nine hundred twelve thousand, two hundred eighty".