22728987 has 6 divisors (see below), whose sum is σ = 32830772. Its totient is φ = 15152652.

The previous prime is 22728977. The next prime is 22729019. The reversal of 22728987 is 78982722.

It is a happy number.

It is not a de Polignac number, because 22728987 - 2¹¹ = 22726939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22728967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1262713 + ... + 1262730.

Almost surely, 2^22728987 is an apocalyptic number.

22728987 is a deficient number, since it is larger than the sum of its proper divisors (10101785).

22728987 is a wasteful number, since it uses less digits than its factorization.

22728987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2525449 (or 2525446 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 22728987 is about 4767.4927372782. The cubic root of 22728987 is about 283.2652891580.

The spelling of 22728987 in words is "twenty-two million, seven hundred twenty-eight thousand, nine hundred eighty-seven".