28791422 has 16 divisors (see below), whose sum is σ = 49593600. Its totient is φ = 12398040.

The previous prime is 28791409. The next prime is 28791431. The reversal of 28791422 is 22419782.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34022 + ... + 34857.

It is an arithmetic number, because the mean of its divisors is an integer number (3099600).

Almost surely, 2^28791422 is an apocalyptic number.

28791422 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

28791422 is a deficient number, since it is larger than the sum of its proper divisors (20802178).

28791422 is a wasteful number, since it uses less digits than its factorization.

28791422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68911.

The product of its digits is 16128, while the sum is 35.

The square root of 28791422 is about 5365.7638785172. The cubic root of 28791422 is about 306.4933375174.

The spelling of 28791422 in words is "twenty-eight million, seven hundred ninety-one thousand, four hundred twenty-two".