111665640 has 32 divisors (see below), whose sum is σ = 334997280. Its totient is φ = 29777472.

The previous prime is 111665623. The next prime is 111665651. The reversal of 111665640 is 46566111.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 111665598 and 111665607.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 465154 + ... + 465393.

It is an arithmetic number, because the mean of its divisors is an integer number (10468665).

Almost surely, 2^111665640 is an apocalyptic number.

111665640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111665640 is an abundant number, since it is smaller than the sum of its proper divisors (223331640).

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

111665640 is a wasteful number, since it uses less digits than its factorization.

111665640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930561 (or 930557 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 111665640 is about 10567.1964115370. The cubic root of 111665640 is about 481.5482990125.

The spelling of 111665640 in words is "one hundred eleven million, six hundred sixty-five thousand, six hundred forty".