28883831 has 4 divisors (see below), whose sum is σ = 29555592. Its totient is φ = 28212072.

The previous prime is 28883821. The next prime is 28883839. The reversal of 28883831 is 13838882.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13838882 = 2 ⋅6919441.

It is a cyclic number.

It is not a de Polignac number, because 28883831 - 2¹⁰ = 28882807 is a prime.

It is a super-2 number, since 2×28883831² = 1668551386473122, 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 (28883839) by changing a digit.

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, 335816 + ... + 335901.

It is an arithmetic number, because the mean of its divisors is an integer number (7388898).

Almost surely, 2^28883831 is an apocalyptic number.

28883831 is a deficient number, since it is larger than the sum of its proper divisors (671761).

28883831 is an equidigital number, since it uses as much as digits as its factorization.

28883831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671760.

The product of its digits is 73728, while the sum is 41.

The square root of 28883831 is about 5374.3679628399. The cubic root of 28883831 is about 306.8208945142.

The spelling of 28883831 in words is "twenty-eight million, eight hundred eighty-three thousand, eight hundred thirty-one".