28286131 has 8 divisors (see below), whose sum is σ = 29020464. Its totient is φ = 27555360.

The previous prime is 28286129. The next prime is 28286143. The reversal of 28286131 is 13168282.

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 28286131 - 2¹ = 28286129 is a prime.

It is a super-2 number, since 2×28286131² = 1600210413898322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28286093 and 28286102.

It is not an unprimeable number, because it can be changed into a prime (28286171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23361 + ... + 24541.

It is an arithmetic number, because the mean of its divisors is an integer number (3627558).

Almost surely, 2^28286131 is an apocalyptic number.

28286131 is a deficient number, since it is larger than the sum of its proper divisors (734333).

28286131 is a wasteful number, since it uses less digits than its factorization.

28286131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1781.

The product of its digits is 4608, while the sum is 31.

The square root of 28286131 is about 5318.4707388497. The cubic root of 28286131 is about 304.6897535016.

The spelling of 28286131 in words is "twenty-eight million, two hundred eighty-six thousand, one hundred thirty-one".