57047781 has 16 divisors (see below), whose sum is σ = 89735168. Its totient is φ = 31546800.

The previous prime is 57047743. The next prime is 57047789. The reversal of 57047781 is 18774075.

It is not a de Polignac number, because 57047781 - 2¹⁰ = 57046757 is a prime.

It is a super-2 number, since 2×57047781² = 6508898634047922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) 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 Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57047789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43165 + ... + 44466.

It is an arithmetic number, because the mean of its divisors is an integer number (5608448).

Almost surely, 2^57047781 is an apocalyptic number.

It is an amenable number.

57047781 is a deficient number, since it is larger than the sum of its proper divisors (32687387).

57047781 is a wasteful number, since it uses less digits than its factorization.

57047781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87672.

The product of its (nonzero) digits is 54880, while the sum is 39.

The square root of 57047781 is about 7552.9981464317. The cubic root of 57047781 is about 384.9576183178.

The spelling of 57047781 in words is "fifty-seven million, forty-seven thousand, seven hundred eighty-one".