667995220 has 12 divisors (see below), whose sum is σ = 1402790004. Its totient is φ = 267198080.

The previous prime is 667995169. The next prime is 667995221. The reversal of 667995220 is 22599766.

It can be written as a sum of positive squares in 2 ways, for example, as 146603664 + 521391556 = 12108^2 + 22834^2 .

It is a super-2 number, since 2×667995220² = 892435227885696800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667995221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16699861 + ... + 16699900.

It is an arithmetic number, because the mean of its divisors is an integer number (116899167).

Almost surely, 2^667995220 is an apocalyptic number.

It is an amenable number.

667995220 is an abundant number, since it is smaller than the sum of its proper divisors (734794784).

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

667995220 is a wasteful number, since it uses less digits than its factorization.

667995220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33399770 (or 33399768 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 46.

The square root of 667995220 is about 25845.6034945985. The cubic root of 667995220 is about 874.1603788025.

The spelling of 667995220 in words is "six hundred sixty-seven million, nine hundred ninety-five thousand, two hundred twenty".