111998780 has 12 divisors (see below), whose sum is σ = 235197480. Its totient is φ = 44799504.

The previous prime is 111998779. The next prime is 111998807. The reversal of 111998780 is 87899111.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2799950 + ... + 2799989.

It is an arithmetic number, because the mean of its divisors is an integer number (19599790).

Almost surely, 2^111998780 is an apocalyptic number.

111998780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111998780 is an abundant number, since it is smaller than the sum of its proper divisors (123198700).

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

111998780 is a wasteful number, since it uses less digits than its factorization.

111998780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5599948 (or 5599946 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 44.

The square root of 111998780 is about 10582.9476045193. The cubic root of 111998780 is about 482.0267026063.

It can be divided in two parts, 1119 and 98780, that added together give a palindrome (99899).

The spelling of 111998780 in words is "one hundred eleven million, nine hundred ninety-eight thousand, seven hundred eighty".