28885831 has 16 divisors (see below), whose sum is σ = 32354560. Its totient is φ = 25608960.

The previous prime is 28885811. The next prime is 28885849. The reversal of 28885831 is 13858882.

It is not a de Polignac number, because 28885831 - 2²¹ = 26788679 is a prime.

It is a super-2 number, since 2×28885831² = 1668782465121122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28885811) 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 15 ways as a sum of consecutive naturals, for example, 92131 + ... + 92443.

It is an arithmetic number, because the mean of its divisors is an integer number (2022160).

Almost surely, 2^28885831 is an apocalyptic number.

28885831 is a deficient number, since it is larger than the sum of its proper divisors (3468729).

28885831 is a wasteful number, since it uses less digits than its factorization.

28885831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586.

The product of its digits is 122880, while the sum is 43.

The square root of 28885831 is about 5374.5540280101. The cubic root of 28885831 is about 306.8279760728.

It can be divided in two parts, 288858 and 31, that multiplied together give a palindrome (8954598).

The spelling of 28885831 in words is "twenty-eight million, eight hundred eighty-five thousand, eight hundred thirty-one".