28936281 has 16 divisors (see below), whose sum is σ = 42375168. Its totient is φ = 17418000.

The previous prime is 28936273. The next prime is 28936301. The reversal of 28936281 is 18263982.

It is a happy number.

It is not a de Polignac number, because 28936281 - 2³ = 28936273 is a prime.

It is a super-2 number, since 2×28936281² = 1674616716221922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28936241) 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, 2080 + ... + 7886.

It is an arithmetic number, because the mean of its divisors is an integer number (2648448).

Almost surely, 2^28936281 is an apocalyptic number.

It is an amenable number.

28936281 is a deficient number, since it is larger than the sum of its proper divisors (13438887).

28936281 is a wasteful number, since it uses less digits than its factorization.

28936281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5972.

The product of its digits is 41472, while the sum is 39.

The square root of 28936281 is about 5379.2453931755. The cubic root of 28936281 is about 307.0065003734.

The spelling of 28936281 in words is "twenty-eight million, nine hundred thirty-six thousand, two hundred eighty-one".