111787920 has 120 divisors (see below), whose sum is σ = 397548216. Its totient is φ = 28053504.

The previous prime is 111787919. The next prime is 111787927. The reversal of 111787920 is 29787111.

It can be written as a sum of positive squares in 4 ways, for example, as 38787984 + 72999936 = 6228^2 + 8544^2 .

It is a tau number, because it is divible by the number of its divisors (120).

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

It is not an unprimeable number, because it can be changed into a prime (111787927) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7674 + ... + 16806.

Almost surely, 2^111787920 is an apocalyptic number.

111787920 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 111787920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (198774108).

111787920 is an abundant number, since it is smaller than the sum of its proper divisors (285760296).

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

111787920 is a wasteful number, since it uses less digits than its factorization.

111787920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9169 (or 9160 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 36.

The square root of 111787920 is about 10572.9806582628. The cubic root of 111787920 is about 481.7240088233.

The spelling of 111787920 in words is "one hundred eleven million, seven hundred eighty-seven thousand, nine hundred twenty".