28112238 has 64 divisors (see below), whose sum is σ = 77898240. Its totient is φ = 7300800.

The previous prime is 28112221. The next prime is 28112291. The reversal of 28112238 is 83221182.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 778 + ... + 7538.

It is an arithmetic number, because the mean of its divisors is an integer number (1217160).

Almost surely, 2^28112238 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28112238, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38949120).

28112238 is an abundant number, since it is smaller than the sum of its proper divisors (49786002).

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

28112238 is a wasteful number, since it uses less digits than its factorization.

28112238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6790 (or 6784 counting only the distinct ones).

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

The square root of 28112238 is about 5302.0975094768. The cubic root of 28112238 is about 304.0640951533.

The spelling of 28112238 in words is "twenty-eight million, one hundred twelve thousand, two hundred thirty-eight".