998709780 has 24 divisors (see below), whose sum is σ = 2796387552. Its totient is φ = 266322592.

The previous prime is 998709779. The next prime is 998709781. The reversal of 998709780 is 87907899.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (998709779) and next prime (998709781).

It is a self number, because there is not a number n which added to its sum of digits gives 998709780.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998709781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8322522 + ... + 8322641.

It is an arithmetic number, because the mean of its divisors is an integer number (116516148).

Almost surely, 2^998709780 is an apocalyptic number.

It is an amenable number.

998709780 is an abundant number, since it is smaller than the sum of its proper divisors (1797677772).

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

998709780 is a wasteful number, since it uses less digits than its factorization.

998709780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16645175 (or 16645173 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 57.

The square root of 998709780 is about 31602.3698478453. The cubic root of 998709780 is about 999.5697415709.

The spelling of 998709780 in words is "nine hundred ninety-eight million, seven hundred nine thousand, seven hundred eighty".