28993222 has 4 divisors (see below), whose sum is σ = 43489836. Its totient is φ = 14496610.

The previous prime is 28993213. The next prime is 28993241. The reversal of 28993222 is 22239982.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7248304 + ... + 7248307.

It is an arithmetic number, because the mean of its divisors is an integer number (10872459).

Almost surely, 2^28993222 is an apocalyptic number.

28993222 is a deficient number, since it is larger than the sum of its proper divisors (14496614).

28993222 is a wasteful number, since it uses less digits than its factorization.

28993222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14496613.

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

The square root of 28993222 is about 5384.5354488572. The cubic root of 28993222 is about 307.2077448835.

The spelling of 28993222 in words is "twenty-eight million, nine hundred ninety-three thousand, two hundred twenty-two".