28227240 has 96 divisors (see below), whose sum is σ = 92874600. Its totient is φ = 7434240.

The previous prime is 28227239. The next prime is 28227247. The reversal of 28227240 is 4272282.

It can be written as a sum of positive squares in 4 ways, for example, as 13527684 + 14699556 = 3678^2 + 3834^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28227247) 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, 31600 + ... + 32480.

Almost surely, 2^28227240 is an apocalyptic number.

28227240 is a gapful number since it is divisible by the number (20) 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 28227240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46437300).

28227240 is an abundant number, since it is smaller than the sum of its proper divisors (64647360).

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

28227240 is a wasteful number, since it uses less digits than its factorization.

28227240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 987 (or 980 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 28227240 is about 5312.9313942493. The cubic root of 28227240 is about 304.4781544990.

The spelling of 28227240 in words is "twenty-eight million, two hundred twenty-seven thousand, two hundred forty".