81703789740 has 288 divisors, whose sum is σ = 272432160000. Its totient is φ = 19740381696.

The previous prime is 81703789723. The next prime is 81703789789. The reversal of 81703789740 is 4798730718.

81703789740 is a `hidden beast` number, since 81 + 70 + 378 + 97 + 40 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 10608411 + ... + 10616109.

It is an arithmetic number, because the mean of its divisors is an integer number (945945000).

Almost surely, 2^81703789740 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 81703789740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136216080000).

81703789740 is an abundant number, since it is smaller than the sum of its proper divisors (190728370260).

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

81703789740 is a wasteful number, since it uses less digits than its factorization.

81703789740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7869 (or 7864 counting only the distinct ones).

The product of its (nonzero) digits is 2370816, while the sum is 54.

The spelling of 81703789740 in words is "eighty-one billion, seven hundred three million, seven hundred eighty-nine thousand, seven hundred forty".