28531722 has 16 divisors (see below), whose sum is σ = 57167712. Its totient is φ = 9493200.

The previous prime is 28531717. The next prime is 28531733. The reversal of 28531722 is 22713582.

It is a self number, because there is not a number n which added to its sum of digits gives 28531722.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 529 + ... + 7572.

It is an arithmetic number, because the mean of its divisors is an integer number (3572982).

Almost surely, 2^28531722 is an apocalyptic number.

28531722 is an abundant number, since it is smaller than the sum of its proper divisors (28635990).

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

28531722 is a wasteful number, since it uses less digits than its factorization.

28531722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8693.

The product of its digits is 6720, while the sum is 30.

The square root of 28531722 is about 5341.5093372567. The cubic root of 28531722 is about 305.5690246306.

The spelling of 28531722 in words is "twenty-eight million, five hundred thirty-one thousand, seven hundred twenty-two".