28057481 has 2 divisors, whose sum is σ = 28057482. Its totient is φ = 28057480.

The previous prime is 28057459. The next prime is 28057483. The reversal of 28057481 is 18475082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24601600 + 3455881 = 4960^2 + 1859^2 .

It is a cyclic number.

It is not a de Polignac number, because 28057481 - 2¹⁸ = 27795337 is a prime.

It is a super-2 number, since 2×28057481² = 1574444480130722, which contains 22 as substring.

Together with 28057483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28057483) 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, 14028740 + 14028741.

It is an arithmetic number, because the mean of its divisors is an integer number (14028741).

Almost surely, 2^28057481 is an apocalyptic number.

It is an amenable number.

28057481 is a deficient number, since it is larger than the sum of its proper divisors (1).

28057481 is an equidigital number, since it uses as much as digits as its factorization.

28057481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 28057481 is about 5296.9312814119. The cubic root of 28057481 is about 303.8665482176.

The spelling of 28057481 in words is "twenty-eight million, fifty-seven thousand, four hundred eighty-one".