81743625700 has 72 divisors (see below), whose sum is σ = 194590982880. Its totient is φ = 29558822400.

The previous prime is 81743625553. The next prime is 81743625701. The reversal of 81743625700 is 752634718.

It is not an unprimeable number, because it can be changed into a prime (81743625701) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 10677 + ... + 404476.

It is an arithmetic number, because the mean of its divisors is an integer number (2702652540).

Almost surely, 2^81743625700 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81743625700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97295491440).

81743625700 is an abundant number, since it is smaller than the sum of its proper divisors (112847357180).

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

81743625700 is a wasteful number, since it uses less digits than its factorization.

81743625700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415357 (or 415350 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 43.

The spelling of 81743625700 in words is "eighty-one billion, seven hundred forty-three million, six hundred twenty-five thousand, seven hundred".