57281863 has 4 divisors (see below), whose sum is σ = 57431808. Its totient is φ = 57131920.

The previous prime is 57281843. The next prime is 57281899. The reversal of 57281863 is 36818275.

57281863 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 57281863 - 2²¹ = 55184711 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57281803) 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 in 3 ways as a sum of consecutive naturals, for example, 74398 + ... + 75163.

It is an arithmetic number, because the mean of its divisors is an integer number (14357952).

Almost surely, 2^57281863 is an apocalyptic number.

57281863 is a deficient number, since it is larger than the sum of its proper divisors (149945).

57281863 is a wasteful number, since it uses less digits than its factorization.

57281863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149944.

The product of its digits is 80640, while the sum is 40.

The square root of 57281863 is about 7568.4782486310. The cubic root of 57281863 is about 385.4834271354.

The spelling of 57281863 in words is "fifty-seven million, two hundred eighty-one thousand, eight hundred sixty-three".