57797781 has 16 divisors (see below), whose sum is σ = 80607744. Its totient is φ = 36767984.

The previous prime is 57797777. The next prime is 57797801. The reversal of 57797781 is 18779775.

It is a happy number.

It is not a de Polignac number, because 57797781 - 2² = 57797777 is a prime.

It is a super-3 number, since 3×57797781³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57797731) 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, 39790 + ... + 41216.

It is an arithmetic number, because the mean of its divisors is an integer number (5037984).

Almost surely, 2^57797781 is an apocalyptic number.

It is an amenable number.

57797781 is a deficient number, since it is larger than the sum of its proper divisors (22809963).

57797781 is a wasteful number, since it uses less digits than its factorization.

57797781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040.

The product of its digits is 864360, while the sum is 51.

The square root of 57797781 is about 7602.4851857797. The cubic root of 57797781 is about 386.6372753951.

The spelling of 57797781 in words is "fifty-seven million, seven hundred ninety-seven thousand, seven hundred eighty-one".