23181228 has 72 divisors (see below), whose sum is σ = 69468672. Its totient is φ = 6621264.

The previous prime is 23181209. The next prime is 23181233. The reversal of 23181228 is 82218132.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5101 + ... + 8507.

Almost surely, 2^23181228 is an apocalyptic number.

23181228 is a gapful number since it is divisible by the number (28) 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 23181228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34734336).

23181228 is an abundant number, since it is smaller than the sum of its proper divisors (46287444).

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

23181228 is a wasteful number, since it uses less digits than its factorization.

23181228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3433 (or 3419 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 23181228 is about 4814.6887749885. The cubic root of 23181228 is about 285.1316842982.

It can be divided in two parts, 23181 and 228, that added together give a square (23409 = 153²).

The spelling of 23181228 in words is "twenty-three million, one hundred eighty-one thousand, two hundred twenty-eight".