669419772 has 72 divisors (see below), whose sum is σ = 1840124160. Its totient is φ = 188828640.

The previous prime is 669419771. The next prime is 669419783. The reversal of 669419772 is 277914966.

It is a super-2 number, since 2×669419772² = 896245662289063968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669419771) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 39247 + ... + 53657.

It is an arithmetic number, because the mean of its divisors is an integer number (25557280).

Almost surely, 2^669419772 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 669419772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (920062080).

669419772 is an abundant number, since it is smaller than the sum of its proper divisors (1170704388).

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

669419772 is a wasteful number, since it uses less digits than its factorization.

669419772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14511 (or 14502 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 51.

The square root of 669419772 is about 25873.1477018163. The cubic root of 669419772 is about 874.7813426967.

The spelling of 669419772 in words is "six hundred sixty-nine million, four hundred nineteen thousand, seven hundred seventy-two".