989722628 has 6 divisors (see below), whose sum is σ = 1732014606. Its totient is φ = 494861312.

The previous prime is 989722619. The next prime is 989722639. The reversal of 989722628 is 826227989.

It can be written as a sum of positive squares in only one way, i.e., 527988484 + 461734144 = 22978^2 + 21488^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 989722628.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 123715325 + ... + 123715332.

It is an arithmetic number, because the mean of its divisors is an integer number (288669101).

Almost surely, 2^989722628 is an apocalyptic number.

It is an amenable number.

989722628 is a deficient number, since it is larger than the sum of its proper divisors (742291978).

989722628 is a wasteful number, since it uses less digits than its factorization.

989722628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247430661 (or 247430659 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 53.

The square root of 989722628 is about 31459.8574059070. The cubic root of 989722628 is about 996.5624058203.

The spelling of 989722628 in words is "nine hundred eighty-nine million, seven hundred twenty-two thousand, six hundred twenty-eight".