57081387 has 24 divisors (see below), whose sum is σ = 84941248. Its totient is φ = 34063920.

The previous prime is 57081361. The next prime is 57081391. The reversal of 57081387 is 78318075.

It is not a de Polignac number, because 57081387 - 2⁷ = 57081259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57081317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23148 + ... + 25494.

Almost surely, 2^57081387 is an apocalyptic number.

57081387 is a deficient number, since it is larger than the sum of its proper divisors (27859861).

57081387 is a wasteful number, since it uses less digits than its factorization.

57081387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2439 (or 2428 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 39.

The square root of 57081387 is about 7555.2224983782. Note that the first 3 decimals coincide. The cubic root of 57081387 is about 385.0331944168.

The spelling of 57081387 in words is "fifty-seven million, eighty-one thousand, three hundred eighty-seven".