28222812 has 36 divisors (see below), whose sum is σ = 72411976. Its totient is φ = 9266400.

The previous prime is 28222783. The next prime is 28222819. The reversal of 28222812 is 21822282.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28222819) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3439 + ... + 8262.

Almost surely, 2^28222812 is an apocalyptic number.

It is an amenable number.

28222812 is an abundant number, since it is smaller than the sum of its proper divisors (44189164).

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

28222812 is a wasteful number, since it uses less digits than its factorization.

28222812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11778 (or 11773 counting only the distinct ones).

The product of its digits is 2048, while the sum is 27.

The square root of 28222812 is about 5312.5146588033. The cubic root of 28222812 is about 304.4622325294.

The spelling of 28222812 in words is "twenty-eight million, two hundred twenty-two thousand, eight hundred twelve".