111864128 has 14 divisors (see below), whose sum is σ = 221980506. Its totient is φ = 55932032.

The previous prime is 111864127. The next prime is 111864139. The reversal of 111864128 is 821468111.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 107163904 + 4700224 = 10352^2 + 2168^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 111864094 and 111864103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111864127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 873875 + ... + 874002.

Almost surely, 2^111864128 is an apocalyptic number.

It is an amenable number.

111864128 is a deficient number, since it is larger than the sum of its proper divisors (110116378).

111864128 is an equidigital number, since it uses as much as digits as its factorization.

111864128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1747889 (or 1747879 counting only the distinct ones).

The product of its digits is 3072, while the sum is 32.

The square root of 111864128 is about 10576.5839475702. The cubic root of 111864128 is about 481.8334508338.

The spelling of 111864128 in words is "one hundred eleven million, eight hundred sixty-four thousand, one hundred twenty-eight".