28222768 has 40 divisors (see below), whose sum is σ = 63567360. Its totient is φ = 11887680.

The previous prime is 28222763. The next prime is 28222769. The reversal of 28222768 is 86722282.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28222763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4473 + ... + 8743.

It is an arithmetic number, because the mean of its divisors is an integer number (1589184).

Almost surely, 2^28222768 is an apocalyptic number.

28222768 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 28222768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31783680).

28222768 is an abundant number, since it is smaller than the sum of its proper divisors (35344592).

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

28222768 is a wasteful number, since it uses less digits than its factorization.

28222768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4345 (or 4339 counting only the distinct ones).

The product of its digits is 43008, while the sum is 37.

The square root of 28222768 is about 5312.5105176366. The cubic root of 28222768 is about 304.4620743082.

The spelling of 28222768 in words is "twenty-eight million, two hundred twenty-two thousand, seven hundred sixty-eight".