28000831 has 2 divisors, whose sum is σ = 28000832. Its totient is φ = 28000830.

The previous prime is 28000799. The next prime is 28000837. The reversal of 28000831 is 13800082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28000831 - 2⁵ = 28000799 is a prime.

It is a super-2 number, since 2×28000831² = 1568093073381122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28000837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14000415 + 14000416.

It is an arithmetic number, because the mean of its divisors is an integer number (14000416).

Almost surely, 2^28000831 is an apocalyptic number.

28000831 is a deficient number, since it is larger than the sum of its proper divisors (1).

28000831 is an equidigital number, since it uses as much as digits as its factorization.

28000831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 28000831 is about 5291.5811436659. The cubic root of 28000831 is about 303.6619012119.

The spelling of 28000831 in words is "twenty-eight million, eight hundred thirty-one", and thus it is an aban number.