28066931 has 2 divisors, whose sum is σ = 28066932. Its totient is φ = 28066930.

The previous prime is 28066921. The next prime is 28066937. The reversal of 28066931 is 13966082.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28066931 is a prime.

It is a super-2 number, since 2×28066931² = 1575505231517522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28066891 and 28066900.

It is not a weakly prime, because it can be changed into another prime (28066937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14033465 + 14033466.

It is an arithmetic number, because the mean of its divisors is an integer number (14033466).

Almost surely, 2^28066931 is an apocalyptic number.

28066931 is a deficient number, since it is larger than the sum of its proper divisors (1).

28066931 is an equidigital number, since it uses as much as digits as its factorization.

28066931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 28066931 is about 5297.8232322342. The cubic root of 28066931 is about 303.9006593405.

The spelling of 28066931 in words is "twenty-eight million, sixty-six thousand, nine hundred thirty-one".