669927220 has 12 divisors (see below), whose sum is σ = 1406847204. Its totient is φ = 267970880.

The previous prime is 669927197. The next prime is 669927239. The reversal of 669927220 is 22729966.

It can be written as a sum of positive squares in 2 ways, for example, as 183548304 + 486378916 = 13548^2 + 22054^2 .

It is a congruent 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, 16748161 + ... + 16748200.

It is an arithmetic number, because the mean of its divisors is an integer number (117237267).

Almost surely, 2^669927220 is an apocalyptic number.

It is an amenable number.

669927220 is an abundant number, since it is smaller than the sum of its proper divisors (736919984).

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

669927220 is a wasteful number, since it uses less digits than its factorization.

669927220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33496370 (or 33496368 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 669927220 is about 25882.9523045575. The cubic root of 669927220 is about 875.0023270686.

The spelling of 669927220 in words is "six hundred sixty-nine million, nine hundred twenty-seven thousand, two hundred twenty".