28423081 has 2 divisors, whose sum is σ = 28423082. Its totient is φ = 28423080.

The previous prime is 28423039. The next prime is 28423121. The reversal of 28423081 is 18032482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25847056 + 2576025 = 5084^2 + 1605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28423081 is a prime.

It is a super-2 number, since 2×28423081² = 1615743067065122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28423181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14211540 + 14211541.

It is an arithmetic number, because the mean of its divisors is an integer number (14211541).

Almost surely, 2^28423081 is an apocalyptic number.

It is an amenable number.

28423081 is a deficient number, since it is larger than the sum of its proper divisors (1).

28423081 is an equidigital number, since it uses as much as digits as its factorization.

28423081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 28423081 is about 5331.3301342160. The cubic root of 28423081 is about 305.1806902098.

The spelling of 28423081 in words is "twenty-eight million, four hundred twenty-three thousand, eighty-one".