81082726 has 4 divisors (see below), whose sum is σ = 121624092. Its totient is φ = 40541362.

The previous prime is 81082723. The next prime is 81082759. The reversal of 81082726 is 62728018.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 81082691 and 81082700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81082721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20270680 + ... + 20270683.

It is an arithmetic number, because the mean of its divisors is an integer number (30406023).

Almost surely, 2^81082726 is an apocalyptic number.

81082726 is a deficient number, since it is larger than the sum of its proper divisors (40541366).

81082726 is a wasteful number, since it uses less digits than its factorization.

81082726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40541365.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 81082726 is about 9004.5947160325. The cubic root of 81082726 is about 432.8221191700.

The spelling of 81082726 in words is "eighty-one million, eighty-two thousand, seven hundred twenty-six".