28090831 has 2 divisors, whose sum is σ = 28090832. Its totient is φ = 28090830.

The previous prime is 28090823. The next prime is 28090837. The reversal of 28090831 is 13809082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28090831 - 2³ = 28090823 is a prime.

It is a super-2 number, since 2×28090831² = 1578189572541122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28090793 and 28090802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28090837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14045415 + 14045416.

It is an arithmetic number, because the mean of its divisors is an integer number (14045416).

Almost surely, 2^28090831 is an apocalyptic number.

28090831 is a deficient number, since it is larger than the sum of its proper divisors (1).

28090831 is an equidigital number, since it uses as much as digits as its factorization.

28090831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 28090831 is about 5300.0783956466. The cubic root of 28090831 is about 303.9868956436.

The spelling of 28090831 in words is "twenty-eight million, ninety thousand, eight hundred thirty-one".