81060057 has 12 divisors (see below), whose sum is σ = 126093604. Its totient is φ = 49883040.

The previous prime is 81060053. The next prime is 81060079. The reversal of 81060057 is 75006018.

81060057 is a `hidden beast` number, since 8 + 1 + 0 + 600 + 57 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21013056 + 60047001 = 4584^2 + 7749^2 .

It is not a de Polignac number, because 81060057 - 2² = 81060053 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81060057.

It is not an unprimeable number, because it can be changed into a prime (81060053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 346294 + ... + 346527.

Almost surely, 2^81060057 is an apocalyptic number.

It is an amenable number.

81060057 is a deficient number, since it is larger than the sum of its proper divisors (45033547).

81060057 is a wasteful number, since it uses less digits than its factorization.

81060057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692840 (or 692837 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 81060057 is about 9003.3358817718. The cubic root of 81060057 is about 432.7817794675.

The spelling of 81060057 in words is "eighty-one million, sixty thousand, fifty-seven".