81255706 has 8 divisors (see below), whose sum is σ = 139295520. Its totient is φ = 34823868.

The previous prime is 81255683. The next prime is 81255749. The reversal of 81255706 is 60755218.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2901976 + ... + 2902003.

It is an arithmetic number, because the mean of its divisors is an integer number (17411940).

Almost surely, 2^81255706 is an apocalyptic number.

81255706 is a deficient number, since it is larger than the sum of its proper divisors (58039814).

81255706 is a wasteful number, since it uses less digits than its factorization.

81255706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5803988.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 81255706 is about 9014.1946950352. The cubic root of 81255706 is about 433.1296914287.

It can be divided in two parts, 8125 and 5706, that added together give a palindrome (13831).

The spelling of 81255706 in words is "eighty-one million, two hundred fifty-five thousand, seven hundred six".