28831386 has 8 divisors (see below), whose sum is σ = 57662784. Its totient is φ = 9610460.

The previous prime is 28831367. The next prime is 28831393. The reversal of 28831386 is 68313882.

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

28831386 is an admirable number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2402610 + ... + 2402621.

It is an arithmetic number, because the mean of its divisors is an integer number (7207848).

Almost surely, 2^28831386 is an apocalyptic number.

28831386 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28831386 is a wasteful number, since it uses less digits than its factorization.

28831386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4805236.

The product of its digits is 55296, while the sum is 39.

The square root of 28831386 is about 5369.4865676338. The cubic root of 28831386 is about 306.6350815506.

It can be divided in two parts, 2 and 8831386, that added together give a palindrome (8831388).

The spelling of 28831386 in words is "twenty-eight million, eight hundred thirty-one thousand, three hundred eighty-six".