28159477 has 2 divisors, whose sum is σ = 28159478. Its totient is φ = 28159476.

The previous prime is 28159459. The next prime is 28159489. The reversal of 28159477 is 77495182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24740676 + 3418801 = 4974^2 + 1849^2 .

It is a cyclic number.

It is not a de Polignac number, because 28159477 - 2¹¹ = 28157429 is a prime.

It is a super-2 number, since 2×28159477² = 1585912289827058, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28159447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14079738 + 14079739.

It is an arithmetic number, because the mean of its divisors is an integer number (14079739).

Almost surely, 2^28159477 is an apocalyptic number.

It is an amenable number.

28159477 is a deficient number, since it is larger than the sum of its proper divisors (1).

28159477 is an equidigital number, since it uses as much as digits as its factorization.

28159477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 43.

The square root of 28159477 is about 5306.5503860795. The cubic root of 28159477 is about 304.2343133794.

The spelling of 28159477 in words is "twenty-eight million, one hundred fifty-nine thousand, four hundred seventy-seven".