989762721228 has 96 divisors (see below), whose sum is σ = 2595434788800. Its totient is φ = 326144636928.

The previous prime is 989762721209. The next prime is 989762721251. The reversal of 989762721228 is 822127267989.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65901976 + ... + 65916992.

It is an arithmetic number, because the mean of its divisors is an integer number (27035779050).

Almost surely, 2^989762721228 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 989762721228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1297717394400).

989762721228 is an abundant number, since it is smaller than the sum of its proper divisors (1605672067572).

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

989762721228 is a wasteful number, since it uses less digits than its factorization.

989762721228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21976 (or 21968 counting only the distinct ones).

The product of its digits is 24385536, while the sum is 63.

The spelling of 989762721228 in words is "nine hundred eighty-nine billion, seven hundred sixty-two million, seven hundred twenty-one thousand, two hundred twenty-eight".