111081720 has 128 divisors (see below), whose sum is σ = 351267840. Its totient is φ = 28047360.

The previous prime is 111081713. The next prime is 111081721. The reversal of 111081720 is 27180111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111081721) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 460800 + ... + 461040.

It is an arithmetic number, because the mean of its divisors is an integer number (2744280).

Almost surely, 2^111081720 is an apocalyptic number.

111081720 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 111081720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (175633920).

111081720 is an abundant number, since it is smaller than the sum of its proper divisors (240186120).

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

111081720 is a wasteful number, since it uses less digits than its factorization.

111081720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445 (or 441 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 21.

The square root of 111081720 is about 10539.5312988766. The cubic root of 111081720 is about 480.7074637136.

The spelling of 111081720 in words is "one hundred eleven million, eighty-one thousand, seven hundred twenty".