668772840 has 64 divisors (see below), whose sum is σ = 2093558400. Its totient is φ = 170584832.

The previous prime is 668772833. The next prime is 668772859. The reversal of 668772840 is 48277866.

It is a super-2 number, since 2×668772840² = 894514223043331200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 668772840.

It is an unprimeable number.

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, 118395 + ... + 123914.

It is an arithmetic number, because the mean of its divisors is an integer number (32711850).

Almost surely, 2^668772840 is an apocalyptic number.

668772840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

668772840 is an abundant number, since it is smaller than the sum of its proper divisors (1424785560).

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

668772840 is a wasteful number, since it uses less digits than its factorization.

668772840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242346 (or 242342 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 48.

The square root of 668772840 is about 25860.6426834292. The cubic root of 668772840 is about 874.4994535794.

The spelling of 668772840 in words is "six hundred sixty-eight million, seven hundred seventy-two thousand, eight hundred forty".