81580798 has 8 divisors (see below), whose sum is σ = 131784408. Its totient is φ = 37652664.

The previous prime is 81580787. The next prime is 81580801. The reversal of 81580798 is 89708518.

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

It is a congruent number.

It is an unprimeable number.

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, 1568836 + ... + 1568887.

It is an arithmetic number, because the mean of its divisors is an integer number (16473051).

Almost surely, 2^81580798 is an apocalyptic number.

81580798 is a deficient number, since it is larger than the sum of its proper divisors (50203610).

81580798 is a wasteful number, since it uses less digits than its factorization.

81580798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3137738.

The product of its (nonzero) digits is 161280, while the sum is 46.

The square root of 81580798 is about 9032.2089214101. The cubic root of 81580798 is about 433.7065519686.

The spelling of 81580798 in words is "eighty-one million, five hundred eighty thousand, seven hundred ninety-eight".