81306798 has 8 divisors (see below), whose sum is σ = 162613608. Its totient is φ = 27102264.

The previous prime is 81306793. The next prime is 81306803. The reversal of 81306798 is 89760318.

It is an interprime number because it is at equal distance from previous prime (81306793) and next prime (81306803).

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

81306798 is an admirable number.

It is a super-2 number, since 2×81306798² = 13221590802025608, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81306793) 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 3 ways as a sum of consecutive naturals, for example, 6775561 + ... + 6775572.

It is an arithmetic number, because the mean of its divisors is an integer number (20326701).

Almost surely, 2^81306798 is an apocalyptic number.

81306798 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81306798 is a wasteful number, since it uses less digits than its factorization.

81306798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13551138.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 81306798 is about 9017.0282244207. The cubic root of 81306798 is about 433.2204535700.

The spelling of 81306798 in words is "eighty-one million, three hundred six thousand, seven hundred ninety-eight".