28227690 has 40 divisors (see below), whose sum is σ = 75903300. Its totient is φ = 7527168.

The previous prime is 28227671. The next prime is 28227691. The reversal of 28227690 is 9672282.

It can be written as a sum of positive squares in 2 ways, for example, as 24413481 + 3814209 = 4941^2 + 1953^2 .

It is a super-2 number, since 2×28227690² = 1593604965472200, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28227691) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 16615 + ... + 18234.

Almost surely, 2^28227690 is an apocalyptic number.

28227690 is an abundant number, since it is smaller than the sum of its proper divisors (47675610).

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

28227690 is a wasteful number, since it uses less digits than its factorization.

28227690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34868 (or 34859 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 28227690 is about 5312.9737435828. The cubic root of 28227690 is about 304.4797724922.

It can be divided in two parts, 282 and 27690, that added together give a palindrome (27972).

The spelling of 28227690 in words is "twenty-eight million, two hundred twenty-seven thousand, six hundred ninety".