989447680 has 120 divisors (see below), whose sum is σ = 2570005152. Its totient is φ = 365174784.

The previous prime is 989447663. The next prime is 989447689. The reversal of 989447680 is 86744989.

It is a super-2 number, since 2×989447680² = 1958013422914764800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989447689) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 431497 + ... + 433783.

Almost surely, 2^989447680 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 989447680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1285002576).

989447680 is an abundant number, since it is smaller than the sum of its proper divisors (1580557472).

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

989447680 is a wasteful number, since it uses less digits than its factorization.

989447680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2336 (or 2307 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 55.

The square root of 989447680 is about 31455.4872796465. The cubic root of 989447680 is about 996.4701145697.

The spelling of 989447680 in words is "nine hundred eighty-nine million, four hundred forty-seven thousand, six hundred eighty".