22272728 has 8 divisors (see below), whose sum is σ = 41761380. Its totient is φ = 11136360.

The previous prime is 22272727. The next prime is 22272749. The reversal of 22272728 is 82727222.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 22272694 and 22272703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22272727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1392038 + ... + 1392053.

Almost surely, 2^22272728 is an apocalyptic number.

It is an amenable number.

22272728 is a deficient number, since it is larger than the sum of its proper divisors (19488652).

22272728 is a wasteful number, since it uses less digits than its factorization.

22272728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2784097 (or 2784093 counting only the distinct ones).

The product of its digits is 12544, while the sum is 32.

The square root of 22272728 is about 4719.3991142941. The cubic root of 22272728 is about 281.3570517253.

The spelling of 22272728 in words is "twenty-two million, two hundred seventy-two thousand, seven hundred twenty-eight".