57281005 has 4 divisors (see below), whose sum is σ = 68737212. Its totient is φ = 45824800.

The previous prime is 57280997. The next prime is 57281009. The reversal of 57281005 is 50018275.

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

It can be written as a sum of positive squares in 2 ways, for example, as 24068836 + 33212169 = 4906^2 + 5763^2 .

It is not a de Polignac number, because 57281005 - 2³ = 57280997 is a prime.

It is a super-2 number, since 2×57281005² = 6562227067620050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57281009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5728096 + ... + 5728105.

It is an arithmetic number, because the mean of its divisors is an integer number (17184303).

Almost surely, 2^57281005 is an apocalyptic number.

It is an amenable number.

57281005 is a deficient number, since it is larger than the sum of its proper divisors (11456207).

57281005 is a wasteful number, since it uses less digits than its factorization.

57281005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11456206.

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 57281005 is about 7568.4215659542. The cubic root of 57281005 is about 385.4815024632.

The spelling of 57281005 in words is "fifty-seven million, two hundred eighty-one thousand, five".