81082798 has 4 divisors (see below), whose sum is σ = 121624200. Its totient is φ = 40541398.

The previous prime is 81082777. The next prime is 81082801. The reversal of 81082798 is 89728018.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20270698 + ... + 20270701.

It is an arithmetic number, because the mean of its divisors is an integer number (30406050).

Almost surely, 2^81082798 is an apocalyptic number.

81082798 is a deficient number, since it is larger than the sum of its proper divisors (40541402).

81082798 is a wasteful number, since it uses less digits than its factorization.

81082798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40541401.

The product of its (nonzero) digits is 64512, while the sum is 43.

The square root of 81082798 is about 9004.5987139905. The cubic root of 81082798 is about 432.8222472827.

The spelling of 81082798 in words is "eighty-one million, eighty-two thousand, seven hundred ninety-eight".