668958120 has 48 divisors (see below), whose sum is σ = 2174115060. Its totient is φ = 178388736.

The previous prime is 668958071. The next prime is 668958127. The reversal of 668958120 is 21859866.

668958120 is a `hidden beast` number, since 6 + 68 + 9 + 581 + 2 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 648109764 + 20848356 = 25458^2 + 4566^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (668958127) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 928749 + ... + 929468.

Almost surely, 2^668958120 is an apocalyptic number.

668958120 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

668958120 is an abundant number, since it is smaller than the sum of its proper divisors (1505156940).

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

668958120 is a wasteful number, since it uses less digits than its factorization.

668958120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1858234 (or 1858227 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 668958120 is about 25864.2247129118. The cubic root of 668958120 is about 874.5802046150.

The spelling of 668958120 in words is "six hundred sixty-eight million, nine hundred fifty-eight thousand, one hundred twenty".