81072998 has 16 divisors (see below), whose sum is σ = 126182400. Its totient is φ = 39025800.

The previous prime is 81072973. The next prime is 81073007. The reversal of 81072998 is 89927018.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 9053 + ... + 15623.

It is an arithmetic number, because the mean of its divisors is an integer number (7886400).

Almost surely, 2^81072998 is an apocalyptic number.

81072998 is a deficient number, since it is larger than the sum of its proper divisors (45109402).

81072998 is a wasteful number, since it uses less digits than its factorization.

81072998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6803.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 81072998 is about 9004.0545311543. The cubic root of 81072998 is about 432.8048090220.

The spelling of 81072998 in words is "eighty-one million, seventy-two thousand, nine hundred ninety-eight".