28522881 has 16 divisors (see below), whose sum is σ = 42521920. Its totient is φ = 18895680.

The previous prime is 28522861. The next prime is 28522903. The reversal of 28522881 is 18822582.

It is a happy number.

It is not a de Polignac number, because 28522881 - 2⁶ = 28522817 is a prime.

It is a super-2 number, since 2×28522881² = 1627109481080322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28522831) 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, 1161 + ... + 7641.

It is an arithmetic number, because the mean of its divisors is an integer number (2657620).

Almost surely, 2^28522881 is an apocalyptic number.

It is an amenable number.

28522881 is a deficient number, since it is larger than the sum of its proper divisors (13999039).

28522881 is a wasteful number, since it uses less digits than its factorization.

28522881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6653 (or 6647 counting only the distinct ones).

The product of its digits is 20480, while the sum is 36.

The square root of 28522881 is about 5340.6816980607. The cubic root of 28522881 is about 305.5374595907.

It can be divided in two parts, 28522 and 881, that added together give a triangular number (29403 = T₂₄₂).

The spelling of 28522881 in words is "twenty-eight million, five hundred twenty-two thousand, eight hundred eighty-one".