22728145 has 16 divisors (see below), whose sum is σ = 30481920. Its totient is φ = 16124800.

The previous prime is 22728143. The next prime is 22728169. The reversal of 22728145 is 54182722.

It is a happy number.

It is not a de Polignac number, because 22728145 - 2¹ = 22728143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22728143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2785 + ... + 7294.

It is an arithmetic number, because the mean of its divisors is an integer number (1905120).

Almost surely, 2^22728145 is an apocalyptic number.

It is an amenable number.

22728145 is a deficient number, since it is larger than the sum of its proper divisors (7753775).

22728145 is a wasteful number, since it uses less digits than its factorization.

22728145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10136.

The product of its digits is 8960, while the sum is 31.

The square root of 22728145 is about 4767.4044300856. The cubic root of 22728145 is about 283.2617912411.

The spelling of 22728145 in words is "twenty-two million, seven hundred twenty-eight thousand, one hundred forty-five".