28868831 has 2 divisors, whose sum is σ = 28868832. Its totient is φ = 28868830.

The previous prime is 28868803. The next prime is 28868837. The reversal of 28868831 is 13886882.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28868831 - 2²² = 24674527 is a prime.

It is a super-2 number, since 2×28868831² = 1666818806613122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28868837) 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, 14434415 + 14434416.

It is an arithmetic number, because the mean of its divisors is an integer number (14434416).

Almost surely, 2^28868831 is an apocalyptic number.

28868831 is a deficient number, since it is larger than the sum of its proper divisors (1).

28868831 is an equidigital number, since it uses as much as digits as its factorization.

28868831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 147456, while the sum is 44.

The square root of 28868831 is about 5372.9722686796. The cubic root of 28868831 is about 306.7677724019.

The spelling of 28868831 in words is "twenty-eight million, eight hundred sixty-eight thousand, eight hundred thirty-one".