669637120 has 40 divisors (see below), whose sum is σ = 1605565764. Its totient is φ = 267853824.

The previous prime is 669637109. The next prime is 669637181. The reversal of 669637120 is 21736966.

It can be written as a sum of positive squares in 2 ways, for example, as 664402176 + 5234944 = 25776^2 + 2288^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128229 + ... + 133348.

Almost surely, 2^669637120 is an apocalyptic number.

It is an amenable number.

669637120 is an abundant number, since it is smaller than the sum of its proper divisors (935928644).

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

669637120 is an equidigital number, since it uses as much as digits as its factorization.

669637120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261600 (or 261584 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 669637120 is about 25877.3476229694. The cubic root of 669637120 is about 874.8760074644.

The spelling of 669637120 in words is "six hundred sixty-nine million, six hundred thirty-seven thousand, one hundred twenty".