22172028 has 24 divisors (see below), whose sum is σ = 53134032. Its totient is φ = 7190784.

The previous prime is 22172027. The next prime is 22172057. The reversal of 22172028 is 82027122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 22171989 and 22172007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22172027) 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, 24525 + ... + 25412.

It is an arithmetic number, because the mean of its divisors is an integer number (2213918).

Almost surely, 2^22172028 is an apocalyptic number.

It is an amenable number.

22172028 is an abundant number, since it is smaller than the sum of its proper divisors (30962004).

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

22172028 is a wasteful number, since it uses less digits than its factorization.

22172028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49981 (or 49979 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 22172028 is about 4708.7182969466. The cubic root of 22172028 is about 280.9323849592.

The spelling of 22172028 in words is "twenty-two million, one hundred seventy-two thousand, twenty-eight".