111990780 has 144 divisors (see below), whose sum is σ = 373935744. Its totient is φ = 26904960.

The previous prime is 111990763. The next prime is 111990799. The reversal of 111990780 is 87099111.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 322567 + ... + 322913.

It is an arithmetic number, because the mean of its divisors is an integer number (2596776).

Almost surely, 2^111990780 is an apocalyptic number.

111990780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111990780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186967872).

111990780 is an abundant number, since it is smaller than the sum of its proper divisors (261944964).

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

111990780 is a wasteful number, since it uses less digits than its factorization.

111990780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536 (or 531 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 36.

The square root of 111990780 is about 10582.5696312380. The cubic root of 111990780 is about 482.0152253818.

The spelling of 111990780 in words is "one hundred eleven million, nine hundred ninety thousand, seven hundred eighty".