961391669728 has 24 divisors (see below), whose sum is σ = 2163131257392. Its totient is φ = 412025001216.

The previous prime is 961391669683. The next prime is 961391669741. The reversal of 961391669728 is 827966193169.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2145963325 + ... + 2145963772.

It is an arithmetic number, because the mean of its divisors is an integer number (90130469058).

Almost surely, 2^961391669728 is an apocalyptic number.

It is an amenable number.

961391669728 is an abundant number, since it is smaller than the sum of its proper divisors (1201739587664).

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

961391669728 is a wasteful number, since it uses less digits than its factorization.

961391669728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4291927114 (or 4291927106 counting only the distinct ones).

The product of its digits is 52907904, while the sum is 67.

The spelling of 961391669728 in words is "nine hundred sixty-one billion, three hundred ninety-one million, six hundred sixty-nine thousand, seven hundred twenty-eight".