28261831 has 8 divisors (see below), whose sum is σ = 30530864. Its totient is φ = 26006400.

The previous prime is 28261819. The next prime is 28261843. The reversal of 28261831 is 13816282.

It is an interprime number because it is at equal distance from previous prime (28261819) and next prime (28261843).

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 28261831 - 2⁷ = 28261703 is a prime.

It is a super-2 number, since 2×28261831² = 1597462182945122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28261793 and 28261802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28261811) 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 7 ways as a sum of consecutive naturals, for example, 1156 + ... + 7606.

It is an arithmetic number, because the mean of its divisors is an integer number (3816358).

Almost surely, 2^28261831 is an apocalyptic number.

28261831 is a deficient number, since it is larger than the sum of its proper divisors (2269033).

28261831 is a wasteful number, since it uses less digits than its factorization.

28261831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6801.

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

The square root of 28261831 is about 5316.1857567245. The cubic root of 28261831 is about 304.6024777242.

It can be divided in two parts, 28261 and 831, that added together give a palindrome (29092).

The spelling of 28261831 in words is "twenty-eight million, two hundred sixty-one thousand, eight hundred thirty-one".