989689986990 has 24 divisors (see below), whose sum is σ = 2573193966408. Its totient is φ = 263917329840.

The previous prime is 989689986983. The next prime is 989689987009. The reversal of 989689986990 is 99689986989.

It is a Harshad number since it is a multiple of its sum of digits (90), and also a Moran number because the ratio is a prime number: 10996555411 = 989689986990 / (9 + 8 + 9 + 6 + 8 + 9 + 9 + 8 + 6 + 9 + 9 + 0).

It is a self number, because there is not a number n which added to its sum of digits gives 989689986990.

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, 5498277616 + ... + 5498277795.

It is an arithmetic number, because the mean of its divisors is an integer number (107216415267).

Almost surely, 2^989689986990 is an apocalyptic number.

989689986990 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

989689986990 is an abundant number, since it is smaller than the sum of its proper divisors (1583503979418).

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

989689986990 is a wasteful number, since it uses less digits than its factorization.

989689986990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10996555424 (or 10996555421 counting only the distinct ones).

The product of its (nonzero) digits is 9795520512, while the sum is 90.

The spelling of 989689986990 in words is "nine hundred eighty-nine billion, six hundred eighty-nine million, nine hundred eighty-six thousand, nine hundred ninety".