28227380 has 12 divisors (see below), whose sum is σ = 59277540. Its totient is φ = 11290944.

The previous prime is 28227373. The next prime is 28227383. The reversal of 28227380 is 8372282.

It can be written as a sum of positive squares in 2 ways, for example, as 22486564 + 5740816 = 4742^2 + 2396^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28227383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 705665 + ... + 705704.

It is an arithmetic number, because the mean of its divisors is an integer number (4939795).

Almost surely, 2^28227380 is an apocalyptic number.

28227380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28227380 is an abundant number, since it is smaller than the sum of its proper divisors (31050160).

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

28227380 is a wasteful number, since it uses less digits than its factorization.

28227380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1411378 (or 1411376 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 28227380 is about 5312.9445696337. The cubic root of 28227380 is about 304.4786578765.

The spelling of 28227380 in words is "twenty-eight million, two hundred twenty-seven thousand, three hundred eighty".