28171422 has 16 divisors (see below), whose sum is σ = 62603280. Its totient is φ = 9390456.

The previous prime is 28171421. The next prime is 28171463. The reversal of 28171422 is 22417182.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28171421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260793 + ... + 260900.

It is an arithmetic number, because the mean of its divisors is an integer number (3912705).

Almost surely, 2^28171422 is an apocalyptic number.

28171422 is an abundant number, since it is smaller than the sum of its proper divisors (34431858).

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

28171422 is a wasteful number, since it uses less digits than its factorization.

28171422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521704 (or 521698 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

The square root of 28171422 is about 5307.6757625160. The cubic root of 28171422 is about 304.2773251293.

The spelling of 28171422 in words is "twenty-eight million, one hundred seventy-one thousand, four hundred twenty-two".