990889056 has 72 divisors (see below), whose sum is σ = 2820911184. Its totient is φ = 329936640.

The previous prime is 990889049. The next prime is 990889073. The reversal of 990889056 is 650988099.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×990889056² = 1963722242601142272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 990888993 and 990889011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 461746 + ... + 463886.

It is an arithmetic number, because the mean of its divisors is an integer number (39179322).

Almost surely, 2^990889056 is an apocalyptic number.

990889056 is a gapful number since it is divisible by the number (96) formed by its first and last digit.

It is an amenable number.

990889056 is an abundant number, since it is smaller than the sum of its proper divisors (1830022128).

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

990889056 is a wasteful number, since it uses less digits than its factorization.

990889056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3764 (or 3753 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 54.

The square root of 990889056 is about 31478.3903019198. The cubic root of 990889056 is about 996.9537484408.

The spelling of 990889056 in words is "nine hundred ninety million, eight hundred eighty-nine thousand, fifty-six".