28522791 has 12 divisors (see below), whose sum is σ = 44945160. Its totient is φ = 17286480.

The previous prime is 28522789. The next prime is 28522799. The reversal of 28522791 is 19722582.

It is not a de Polignac number, because 28522791 - 2¹ = 28522789 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28522799) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 143956 + ... + 144153.

It is an arithmetic number, because the mean of its divisors is an integer number (3745430).

Almost surely, 2^28522791 is an apocalyptic number.

28522791 is a deficient number, since it is larger than the sum of its proper divisors (16422369).

28522791 is a wasteful number, since it uses less digits than its factorization.

28522791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288126 (or 288123 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 28522791 is about 5340.6732721634. The cubic root of 28522791 is about 305.5371382300.

The spelling of 28522791 in words is "twenty-eight million, five hundred twenty-two thousand, seven hundred ninety-one".