81828971700 has 72 divisors (see below), whose sum is σ = 270581140032. Its totient is φ = 18703764480.

The previous prime is 81828971687. The next prime is 81828971701. The reversal of 81828971700 is 717982818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81828971701) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19480989 + ... + 19485188.

Almost surely, 2^81828971700 is an apocalyptic number.

It is an amenable number.

81828971700 is an abundant number, since it is smaller than the sum of its proper divisors (188752168332).

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

81828971700 is a wasteful number, since it uses less digits than its factorization.

81828971700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38966201 (or 38966194 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 51.

The spelling of 81828971700 in words is "eighty-one billion, eight hundred twenty-eight million, nine hundred seventy-one thousand, seven hundred".