57781371 has 8 divisors (see below), whose sum is σ = 77200704. Its totient is φ = 38441480.

The previous prime is 57781331. The next prime is 57781417. The reversal of 57781371 is 17318775.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57781371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (57781331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18141 + ... + 21086.

It is an arithmetic number, because the mean of its divisors is an integer number (9650088).

Almost surely, 2^57781371 is an apocalyptic number.

57781371 is a deficient number, since it is larger than the sum of its proper divisors (19419333).

57781371 is a wasteful number, since it uses less digits than its factorization.

57781371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39721.

The product of its digits is 41160, while the sum is 39.

The square root of 57781371 is about 7601.4058568136. The cubic root of 57781371 is about 386.6006804593.

The spelling of 57781371 in words is "fifty-seven million, seven hundred eighty-one thousand, three hundred seventy-one".