28074228 has 96 divisors (see below), whose sum is σ = 82489344. Its totient is φ = 7233408.

The previous prime is 28074223. The next prime is 28074271. The reversal of 28074228 is 82247082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28074223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51051 + ... + 51597.

It is an arithmetic number, because the mean of its divisors is an integer number (859264).

Almost surely, 2^28074228 is an apocalyptic number.

28074228 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 28074228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41244672).

28074228 is an abundant number, since it is smaller than the sum of its proper divisors (54415116).

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

28074228 is a wasteful number, since it uses less digits than its factorization.

28074228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621 (or 619 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 33.

The square root of 28074228 is about 5298.5118665527. The cubic root of 28074228 is about 303.9269936645.

The spelling of 28074228 in words is "twenty-eight million, seventy-four thousand, two hundred twenty-eight".