28255381 has 8 divisors (see below), whose sum is σ = 35227584. Its totient is φ = 22017120.

The previous prime is 28255379. The next prime is 28255391. The reversal of 28255381 is 18355282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28255381 - 2¹ = 28255379 is a prime.

It is a super-2 number, since 2×28255381² = 1596733110910322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28255301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183400 + ... + 183553.

It is an arithmetic number, because the mean of its divisors is an integer number (4403448).

Almost surely, 2^28255381 is an apocalyptic number.

It is an amenable number.

28255381 is a deficient number, since it is larger than the sum of its proper divisors (6972203).

28255381 is a wasteful number, since it uses less digits than its factorization.

28255381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366971.

The product of its digits is 19200, while the sum is 34.

The square root of 28255381 is about 5315.5790841638. The cubic root of 28255381 is about 304.5793035303.

Subtracting from 28255381 its reverse (18355282), we obtain a palindrome (9900099).

The spelling of 28255381 in words is "twenty-eight million, two hundred fifty-five thousand, three hundred eighty-one".