28252861 has 24 divisors (see below), whose sum is σ = 37490040. Its totient is φ = 21030912.

The previous prime is 28252841. The next prime is 28252871. The reversal of 28252861 is 16825282.

It can be written as a sum of positive squares in 4 ways, for example, as 3062500 + 25190361 = 1750^2 + 5019^2 .

It is not a de Polignac number, because 28252861 - 2⁷ = 28252733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28252841) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9525 + ... + 12133.

It is an arithmetic number, because the mean of its divisors is an integer number (1562085).

Almost surely, 2^28252861 is an apocalyptic number.

It is an amenable number.

28252861 is a deficient number, since it is larger than the sum of its proper divisors (9237179).

28252861 is a wasteful number, since it uses less digits than its factorization.

28252861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2653 (or 2646 counting only the distinct ones).

The product of its digits is 15360, while the sum is 34.

The square root of 28252861 is about 5315.3420397939. The cubic root of 28252861 is about 304.5702484684.

The spelling of 28252861 in words is "twenty-eight million, two hundred fifty-two thousand, eight hundred sixty-one".