22273428 has 12 divisors (see below), whose sum is σ = 51971360. Its totient is φ = 7424472.

The previous prime is 22273423. The next prime is 22273439. The reversal of 22273428 is 82437222.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×22273428² = 992211189742368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22273395 and 22273404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22273423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 928048 + ... + 928071.

Almost surely, 2^22273428 is an apocalyptic number.

It is an amenable number.

22273428 is an abundant number, since it is smaller than the sum of its proper divisors (29697932).

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

22273428 is a wasteful number, since it uses less digits than its factorization.

22273428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1856126 (or 1856124 counting only the distinct ones).

The product of its digits is 10752, while the sum is 30.

The square root of 22273428 is about 4719.4732756951. The cubic root of 22273428 is about 281.3599992444.

The spelling of 22273428 in words is "twenty-two million, two hundred seventy-three thousand, four hundred twenty-eight".