83944500640 has 384 divisors, whose sum is σ = 268435980288. Its totient is φ = 23955886080.

The previous prime is 83944500623. The next prime is 83944500643. The reversal of 83944500640 is 4600544938.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (83944500643) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20338257 + ... + 20342383.

It is an arithmetic number, because the mean of its divisors is an integer number (699052032).

Almost surely, 2^83944500640 is an apocalyptic number.

83944500640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 83944500640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134217990144).

83944500640 is an abundant number, since it is smaller than the sum of its proper divisors (184491479648).

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

83944500640 is a wasteful number, since it uses less digits than its factorization.

83944500640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4300 (or 4292 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 83944500640 in words is "eighty-three billion, nine hundred forty-four million, five hundred thousand, six hundred forty".