989978634476 has 24 divisors (see below), whose sum is σ = 1865770193280. Its totient is φ = 456903119232.

The previous prime is 989978634431. The next prime is 989978634481. The reversal of 989978634476 is 674436879989.

It is a self number, because there is not a number n which added to its sum of digits gives 989978634476.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2497445 + ... + 2866563.

It is an arithmetic number, because the mean of its divisors is an integer number (77740424720).

Almost surely, 2^989978634476 is an apocalyptic number.

It is an amenable number.

989978634476 is a deficient number, since it is larger than the sum of its proper divisors (875791558804).

989978634476 is a wasteful number, since it uses less digits than its factorization.

989978634476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420713 (or 420711 counting only the distinct ones).

The product of its digits is 3950456832, while the sum is 80.

The spelling of 989978634476 in words is "nine hundred eighty-nine billion, nine hundred seventy-eight million, six hundred thirty-four thousand, four hundred seventy-six".