28222909 has 16 divisors (see below), whose sum is σ = 34602624. Its totient is φ = 22651200.

The previous prime is 28222903. The next prime is 28222933. The reversal of 28222909 is 90922282.

It is not a de Polignac number, because 28222909 - 2⁵ = 28222877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28222903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1002 + ... + 7579.

It is an arithmetic number, because the mean of its divisors is an integer number (2162664).

Almost surely, 2^28222909 is an apocalyptic number.

It is an amenable number.

28222909 is a deficient number, since it is larger than the sum of its proper divisors (6379715).

28222909 is a wasteful number, since it uses less digits than its factorization.

28222909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8628.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 28222909 is about 5312.5237881820. The cubic root of 28222909 is about 304.4625813347.

The spelling of 28222909 in words is "twenty-eight million, two hundred twenty-two thousand, nine hundred nine".