111887820 has 72 divisors (see below), whose sum is σ = 370253520. Its totient is φ = 27123840.

The previous prime is 111887819. The next prime is 111887821. The reversal of 111887820 is 28788111.

It is an interprime number because it is at equal distance from previous prime (111887819) and next prime (111887821).

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 (111887821) 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, 26275 + ... + 30234.

It is an arithmetic number, because the mean of its divisors is an integer number (5142410).

Almost surely, 2^111887820 is an apocalyptic number.

111887820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111887820 is an abundant number, since it is smaller than the sum of its proper divisors (258365700).

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

111887820 is a wasteful number, since it uses less digits than its factorization.

111887820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56535 (or 56530 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 36.

The square root of 111887820 is about 10577.7039096394. The cubic root of 111887820 is about 481.8674646936.

The spelling of 111887820 in words is "one hundred eleven million, eight hundred eighty-seven thousand, eight hundred twenty".