28147831 has 2 divisors, whose sum is σ = 28147832. Its totient is φ = 28147830.

The previous prime is 28147813. The next prime is 28147849. The reversal of 28147831 is 13874182.

It is a happy number.

Together with previous prime (28147813) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (28147813) and next prime (28147849).

It is a cyclic number.

It is not a de Polignac number, because 28147831 - 2⁷ = 28147703 is a prime.

It is a super-2 number, since 2×28147831² = 1584600780009122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28142831) 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 as a sum of consecutive naturals, namely, 14073915 + 14073916.

It is an arithmetic number, because the mean of its divisors is an integer number (14073916).

Almost surely, 2^28147831 is an apocalyptic number.

28147831 is a deficient number, since it is larger than the sum of its proper divisors (1).

28147831 is an equidigital number, since it uses as much as digits as its factorization.

28147831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 34.

The square root of 28147831 is about 5305.4529495605. The cubic root of 28147831 is about 304.1923665614.

The spelling of 28147831 in words is "twenty-eight million, one hundred forty-seven thousand, eight hundred thirty-one".