989870085 has 32 divisors (see below), whose sum is σ = 1771015680. Its totient is φ = 524556864.

The previous prime is 989870069. The next prime is 989870087. The reversal of 989870085 is 580078989.

It is not a de Polignac number, because 989870085 - 2⁴ = 989870069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989870087) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2157 + ... + 44546.

It is an arithmetic number, because the mean of its divisors is an integer number (55344240).

Almost surely, 2^989870085 is an apocalyptic number.

It is an amenable number.

989870085 is a deficient number, since it is larger than the sum of its proper divisors (781145595).

989870085 is a wasteful number, since it uses less digits than its factorization.

989870085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46874 (or 46868 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 54.

The square root of 989870085 is about 31462.2008924996. The cubic root of 989870085 is about 996.6118953780.

The spelling of 989870085 in words is "nine hundred eighty-nine million, eight hundred seventy thousand, eighty-five".