111987280 has 40 divisors (see below), whose sum is σ = 260992224. Its totient is φ = 44688000.

The previous prime is 111987269. The next prime is 111987287. The reversal of 111987280 is 82789111.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111987287) 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, 37855 + ... + 40705.

Almost surely, 2^111987280 is an apocalyptic number.

111987280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111987280 is an abundant number, since it is smaller than the sum of its proper divisors (149004944).

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

111987280 is a wasteful number, since it uses less digits than its factorization.

111987280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3355 (or 3349 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 37.

The square root of 111987280 is about 10582.4042636822. The cubic root of 111987280 is about 482.0102039242.

The spelling of 111987280 in words is "one hundred eleven million, nine hundred eighty-seven thousand, two hundred eighty".