667222278 has 16 divisors (see below), whose sum is σ = 1404678720. Its totient is φ = 210701736.

The previous prime is 667222277. The next prime is 667222279. The reversal of 667222278 is 872222766.

It is an interprime number because it is at equal distance from previous prime (667222277) and next prime (667222279).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667222277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2926300 + ... + 2926527.

It is an arithmetic number, because the mean of its divisors is an integer number (87792420).

Almost surely, 2^667222278 is an apocalyptic number.

667222278 is an abundant number, since it is smaller than the sum of its proper divisors (737456442).

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

667222278 is a wasteful number, since it uses less digits than its factorization.

667222278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5852851.

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

The square root of 667222278 is about 25830.6461010947. The cubic root of 667222278 is about 873.8230829515.

The spelling of 667222278 in words is "six hundred sixty-seven million, two hundred twenty-two thousand, two hundred seventy-eight".