667408722 has 8 divisors (see below), whose sum is σ = 1334817456. Its totient is φ = 222469572.

The previous prime is 667408717. The next prime is 667408739. The reversal of 667408722 is 227804766.

It is a sphenic number, since it is the product of 3 distinct primes.

667408722 is an admirable number.

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 3 ways as a sum of consecutive naturals, for example, 55617388 + ... + 55617399.

It is an arithmetic number, because the mean of its divisors is an integer number (166852182).

Almost surely, 2^667408722 is an apocalyptic number.

667408722 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

667408722 is a wasteful number, since it uses less digits than its factorization.

667408722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111234792.

The product of its (nonzero) digits is 225792, while the sum is 42.

The square root of 667408722 is about 25834.2548179738. The cubic root of 667408722 is about 873.9044670737.

The spelling of 667408722 in words is "six hundred sixty-seven million, four hundred eight thousand, seven hundred twenty-two".