28281807 has 24 divisors (see below), whose sum is σ = 41968368. Its totient is φ = 18345600.

The previous prime is 28281791. The next prime is 28281809. The reversal of 28281807 is 70818282.

It is not a de Polignac number, because 28281807 - 2⁴ = 28281791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28281809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 100507 + ... + 100787.

It is an arithmetic number, because the mean of its divisors is an integer number (1748682).

Almost surely, 2^28281807 is an apocalyptic number.

28281807 is a deficient number, since it is larger than the sum of its proper divisors (13686561).

28281807 is a wasteful number, since it uses less digits than its factorization.

28281807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551 (or 548 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 28281807 is about 5318.0642154829. The cubic root of 28281807 is about 304.6742270983.

The spelling of 28281807 in words is "twenty-eight million, two hundred eighty-one thousand, eight hundred seven".