83840442640 has 40 divisors (see below), whose sum is σ = 196821563328. Its totient is φ = 33210579840.

The previous prime is 83840442629. The next prime is 83840442641. The reversal of 83840442640 is 4624404838.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×83840442640² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (83840442641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5079166 + ... + 5095645.

Almost surely, 2^83840442640 is an apocalyptic number.

83840442640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

83840442640 is an abundant number, since it is smaller than the sum of its proper divisors (112981120688).

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

83840442640 is a wasteful number, since it uses less digits than its factorization.

83840442640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10174927 (or 10174921 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 43.

The spelling of 83840442640 in words is "eighty-three billion, eight hundred forty million, four hundred forty-two thousand, six hundred forty".