667222776 has 96 divisors (see below), whose sum is σ = 2024708400. Its totient is φ = 196715520.

The previous prime is 667222757. The next prime is 667222793. The reversal of 667222776 is 677222766.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17920 + ... + 40688.

Almost surely, 2^667222776 is an apocalyptic number.

667222776 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 667222776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1012354200).

667222776 is an abundant number, since it is smaller than the sum of its proper divisors (1357485624).

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

667222776 is a wasteful number, since it uses less digits than its factorization.

667222776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22829 (or 22822 counting only the distinct ones).

The product of its digits is 592704, while the sum is 45.

The square root of 667222776 is about 25830.6557408053. The cubic root of 667222776 is about 873.8233003522.

The spelling of 667222776 in words is "six hundred sixty-seven million, two hundred twenty-two thousand, seven hundred seventy-six".