1669128756 has 48 divisors (see below), whose sum is σ = 4137853440. Its totient is φ = 522668160.

The previous prime is 1669128743. The next prime is 1669128757. The reversal of 1669128756 is 6578219661.

It is a super-2 number, since 2×1669128756² = 5571981608212215072, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1669128699 and 1669128708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1669128757) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51940 + ... + 77691.

It is an arithmetic number, because the mean of its divisors is an integer number (86205280).

Almost surely, 2^1669128756 is an apocalyptic number.

It is an amenable number.

1669128756 is an abundant number, since it is smaller than the sum of its proper divisors (2468724684).

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

1669128756 is a wasteful number, since it uses less digits than its factorization.

1669128756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129704 (or 129702 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 51.

The square root of 1669128756 is about 40854.9722310516. The cubic root of 1669128756 is about 1186.2146401837.

The spelling of 1669128756 in words is "one billion, six hundred sixty-nine million, one hundred twenty-eight thousand, seven hundred fifty-six".