9921392628 has 24 divisors (see below), whose sum is σ = 26457047232. Its totient is φ = 2834683584.

The previous prime is 9921392597. The next prime is 9921392653. The reversal of 9921392628 is 8262931299.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59055825 + ... + 59055992.

It is an arithmetic number, because the mean of its divisors is an integer number (1102376968).

Almost surely, 2^9921392628 is an apocalyptic number.

It is an amenable number.

9921392628 is an abundant number, since it is smaller than the sum of its proper divisors (16535654604).

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

9921392628 is a wasteful number, since it uses less digits than its factorization.

9921392628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118111831 (or 118111829 counting only the distinct ones).

The product of its digits is 839808, while the sum is 51.

The square root of 9921392628 is about 99606.1876993593. The cubic root of 9921392628 is about 2148.7746851150.

The spelling of 9921392628 in words is "nine billion, nine hundred twenty-one million, three hundred ninety-two thousand, six hundred twenty-eight".