83856140840 has 16 divisors (see below), whose sum is σ = 188676316980. Its totient is φ = 33542456320.

The previous prime is 83856140833. The next prime is 83856140867. The reversal of 83856140840 is 4804165838.

It can be written as a sum of positive squares in 2 ways, for example, as 81157753924 + 2698386916 = 284882^2 + 51946^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1048201721 + ... + 1048201800.

Almost surely, 2^83856140840 is an apocalyptic number.

It is an amenable number.

83856140840 is an abundant number, since it is smaller than the sum of its proper divisors (104820176140).

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

83856140840 is a wasteful number, since it uses less digits than its factorization.

83856140840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2096403532 (or 2096403528 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 47.

The spelling of 83856140840 in words is "eighty-three billion, eight hundred fifty-six million, one hundred forty thousand, eight hundred forty".