668781822 has 16 divisors (see below), whose sum is σ = 1340760960. Its totient is φ = 222394392.

The previous prime is 668781811. The next prime is 668781829. The reversal of 668781822 is 228187866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668781829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130498 + ... + 135525.

It is an arithmetic number, because the mean of its divisors is an integer number (83797560).

Almost surely, 2^668781822 is an apocalyptic number.

668781822 is an abundant number, since it is smaller than the sum of its proper divisors (671979138).

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

668781822 is a wasteful number, since it uses less digits than its factorization.

668781822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266447.

The product of its digits is 516096, while the sum is 48.

The square root of 668781822 is about 25860.8163444235. The cubic root of 668781822 is about 874.5033685704.

The spelling of 668781822 in words is "six hundred sixty-eight million, seven hundred eighty-one thousand, eight hundred twenty-two".