83321640 has 192 divisors, whose sum is σ = 293155200. Its totient is φ = 20461056.

The previous prime is 83321621. The next prime is 83321681. The reversal of 83321640 is 4612338.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 239947 + ... + 240293.

It is an arithmetic number, because the mean of its divisors is an integer number (1526850).

Almost surely, 2^83321640 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 83321640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146577600).

83321640 is an abundant number, since it is smaller than the sum of its proper divisors (209833560).

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

83321640 is a wasteful number, since it uses less digits than its factorization.

83321640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416 (or 409 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 83321640 is about 9128.0687990396. The cubic root of 83321640 is about 436.7698012774.

Adding to 83321640 its reverse (4612338), we get a palindrome (87933978).

The spelling of 83321640 in words is "eighty-three million, three hundred twenty-one thousand, six hundred forty".