57485781 has 24 divisors (see below), whose sum is σ = 86652384. Its totient is φ = 38082960.

The previous prime is 57485767. The next prime is 57485783. The reversal of 57485781 is 18758475.

It is a happy number.

57485781 is a `hidden beast` number, since 5 + 74 + 8 + 578 + 1 = 666.

It is not a de Polignac number, because 57485781 - 2¹⁸ = 57223637 is a prime.

It is a super-2 number, since 2×57485781² = 6609230034359922, which contains 22 as substring.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57485783) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43330 + ... + 44636.

It is an arithmetic number, because the mean of its divisors is an integer number (3610516).

Almost surely, 2^57485781 is an apocalyptic number.

It is an amenable number.

57485781 is a deficient number, since it is larger than the sum of its proper divisors (29166603).

57485781 is a wasteful number, since it uses less digits than its factorization.

57485781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1503 (or 1491 counting only the distinct ones).

The product of its digits is 313600, while the sum is 45.

The square root of 57485781 is about 7581.9378129869. The cubic root of 57485781 is about 385.9403135540.

The spelling of 57485781 in words is "fifty-seven million, four hundred eighty-five thousand, seven hundred eighty-one".