28222380 has 144 divisors (see below), whose sum is σ = 94820544. Its totient is φ = 6758400.

The previous prime is 28222367. The next prime is 28222387. The reversal of 28222380 is 8322282.

28222380 is a `hidden beast` number, since 282 + 2 + 2 + 380 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28222387) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 70180 + ... + 70580.

It is an arithmetic number, because the mean of its divisors is an integer number (658476).

Almost surely, 2^28222380 is an apocalyptic number.

28222380 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 28222380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47410272).

28222380 is an abundant number, since it is smaller than the sum of its proper divisors (66598164).

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

28222380 is a wasteful number, since it uses less digits than its factorization.

28222380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456 (or 451 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 28222380 is about 5312.4739999364. The cubic root of 28222380 is about 304.4606790774.

The spelling of 28222380 in words is "twenty-eight million, two hundred twenty-two thousand, three hundred eighty".