989878767878990 has 256 divisors, whose sum is σ = 2029812855459840. Its totient is φ = 344524078080000.

The previous prime is 989878767878989. The next prime is 989878767879061. The reversal of 989878767878990 is 99878767878989.

It is a Harshad number since it is a multiple of its sum of digits (110).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 8777721305 + ... + 8777834075.

It is an arithmetic number, because the mean of its divisors is an integer number (7928956466640).

Almost surely, 2^{989878767878990} is an apocalyptic number.

989878767878990 is an abundant number, since it is smaller than the sum of its proper divisors (1039934087580850).

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

989878767878990 is a wasteful number, since it uses less digits than its factorization.

989878767878990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113179.

The product of its (nonzero) digits is 3097158156288, while the sum is 110.

It can be divided in two parts, 9898787 and 67878990, that added together give a palindrome (77777777).

The spelling of 989878767878990 in words is "nine hundred eighty-nine trillion, eight hundred seventy-eight billion, seven hundred sixty-seven million, eight hundred seventy-eight thousand, nine hundred ninety".