28065931 has 2 divisors, whose sum is σ = 28065932. Its totient is φ = 28065930.

The previous prime is 28065913. The next prime is 28065941. The reversal of 28065931 is 13956082.

Together with previous prime (28065913) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28065931 - 2¹³ = 28057739 is a prime.

It is a super-2 number, since 2×28065931² = 1575392965793522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28065941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14032965 + 14032966.

It is an arithmetic number, because the mean of its divisors is an integer number (14032966).

Almost surely, 2^28065931 is an apocalyptic number.

28065931 is a deficient number, since it is larger than the sum of its proper divisors (1).

28065931 is an equidigital number, since it uses as much as digits as its factorization.

28065931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 28065931 is about 5297.7288530086. The cubic root of 28065931 is about 303.8970500602.

The spelling of 28065931 in words is "twenty-eight million, sixty-five thousand, nine hundred thirty-one".