669128112 has 60 divisors (see below), whose sum is σ = 1885092144. Its totient is φ = 221558400.

The previous prime is 669128101. The next prime is 669128113. The reversal of 669128112 is 211821966.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (669128113) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6358 + ... + 37130.

Almost surely, 2^669128112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669128112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (942546072).

669128112 is an abundant number, since it is smaller than the sum of its proper divisors (1215964032).

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

669128112 is a wasteful number, since it uses less digits than its factorization.

669128112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30938 (or 30929 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 669128112 is about 25867.5107422419. The cubic root of 669128112 is about 874.6542795295.

The spelling of 669128112 in words is "six hundred sixty-nine million, one hundred twenty-eight thousand, one hundred twelve".