111451428 has 72 divisors (see below), whose sum is σ = 308520576. Its totient is φ = 33643200.

The previous prime is 111451427. The next prime is 111451433. The reversal of 111451428 is 824154111.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (111451423) 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, 170350 + ... + 171002.

It is an arithmetic number, because the mean of its divisors is an integer number (4285008).

Almost surely, 2^111451428 is an apocalyptic number.

111451428 is a gapful number since it is divisible by the number (18) 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 111451428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154260288).

111451428 is an abundant number, since it is smaller than the sum of its proper divisors (197069148).

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

111451428 is a wasteful number, since it uses less digits than its factorization.

111451428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105 (or 1100 counting only the distinct ones).

The product of its digits is 1280, while the sum is 27.

The square root of 111451428 is about 10557.0558395795. The cubic root of 111451428 is about 481.2401784019.

The spelling of 111451428 in words is "one hundred eleven million, four hundred fifty-one thousand, four hundred twenty-eight".