81588057 has 4 divisors (see below), whose sum is σ = 108784080. Its totient is φ = 54392036.

The previous prime is 81588053. The next prime is 81588097. The reversal of 81588057 is 75088518.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81588057 - 2² = 81588053 is a prime.

It is a super-2 number, since 2×81588057² = 13313222090070498, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81588053) 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 3 ways as a sum of consecutive naturals, for example, 13598007 + ... + 13598012.

It is an arithmetic number, because the mean of its divisors is an integer number (27196020).

Almost surely, 2^81588057 is an apocalyptic number.

It is an amenable number.

81588057 is a deficient number, since it is larger than the sum of its proper divisors (27196023).

81588057 is a wasteful number, since it uses less digits than its factorization.

81588057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27196022.

The product of its (nonzero) digits is 89600, while the sum is 42.

The square root of 81588057 is about 9032.6107521580. The cubic root of 81588057 is about 433.7194152181.

The spelling of 81588057 in words is "eighty-one million, five hundred eighty-eight thousand, fifty-seven".