669831756 has 96 divisors (see below), whose sum is σ = 1863751680. Its totient is φ = 184857600.

The previous prime is 669831751. The next prime is 669831781. The reversal of 669831756 is 657138966.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 669831699 and 669831708.

It is not an unprimeable number, because it can be changed into a prime (669831751) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64750 + ... + 74378.

It is an arithmetic number, because the mean of its divisors is an integer number (19414080).

Almost surely, 2^669831756 is an apocalyptic number.

669831756 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669831756, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (931875840).

669831756 is an abundant number, since it is smaller than the sum of its proper divisors (1193919924).

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

669831756 is a wasteful number, since it uses less digits than its factorization.

669831756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9695 (or 9693 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 51.

The square root of 669831756 is about 25881.1080906518. The cubic root of 669831756 is about 874.9607627575.

The spelling of 669831756 in words is "six hundred sixty-nine million, eight hundred thirty-one thousand, seven hundred fifty-six".