28939222 has 12 divisors (see below), whose sum is σ = 47005380. Its totient is φ = 13356408.

The previous prime is 28939199. The next prime is 28939231. The reversal of 28939222 is 22293982.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 42472 + ... + 43147.

It is an arithmetic number, because the mean of its divisors is an integer number (3917115).

Almost surely, 2^28939222 is an apocalyptic number.

28939222 is a deficient number, since it is larger than the sum of its proper divisors (18066158).

28939222 is a wasteful number, since it uses less digits than its factorization.

28939222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85647 (or 85634 counting only the distinct ones).

The product of its digits is 31104, while the sum is 37.

The square root of 28939222 is about 5379.5187517100. The cubic root of 28939222 is about 307.0169011056.

It can be divided in two parts, 28939 and 222, that added together give a triangular number (29161 = T₂₄₁).

The spelling of 28939222 in words is "twenty-eight million, nine hundred thirty-nine thousand, two hundred twenty-two".