81830073 has 24 divisors (see below), whose sum is σ = 119255808. Its totient is φ = 49614336.

The previous prime is 81830053. The next prime is 81830081. The reversal of 81830073 is 37003818.

It is not a de Polignac number, because 81830073 - 2⁵ = 81830041 is a prime.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 81830073.

It is not an unprimeable number, because it can be changed into a prime (81830053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 366840 + ... + 367062.

It is an arithmetic number, because the mean of its divisors is an integer number (4968992).

Almost surely, 2^81830073 is an apocalyptic number.

It is an amenable number.

81830073 is a deficient number, since it is larger than the sum of its proper divisors (37425735).

81830073 is a wasteful number, since it uses less digits than its factorization.

81830073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433 (or 336 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 81830073 is about 9045.9976232586. The cubic root of 81830073 is about 434.1478415674.

The spelling of 81830073 in words is "eighty-one million, eight hundred thirty thousand, seventy-three".