28185457 has 2 divisors, whose sum is σ = 28185458. Its totient is φ = 28185456.

The previous prime is 28185431. The next prime is 28185461. The reversal of 28185457 is 75458182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27836176 + 349281 = 5276^2 + 591^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28185457 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28185407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14092728 + 14092729.

It is an arithmetic number, because the mean of its divisors is an integer number (14092729).

Almost surely, 2^28185457 is an apocalyptic number.

It is an amenable number.

28185457 is a deficient number, since it is larger than the sum of its proper divisors (1).

28185457 is an equidigital number, since it uses as much as digits as its factorization.

28185457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 89600, while the sum is 40.

The square root of 28185457 is about 5308.9977396868. The cubic root of 28185457 is about 304.3278470526.

The spelling of 28185457 in words is "twenty-eight million, one hundred eighty-five thousand, four hundred fifty-seven".