83989640 has 64 divisors (see below), whose sum is σ = 218764800. Its totient is φ = 28424448.

The previous prime is 83989613. The next prime is 83989649. The reversal of 83989640 is 4698938.

It is not an unprimeable number, because it can be changed into a prime (83989649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20222 + ... + 24018.

It is an arithmetic number, because the mean of its divisors is an integer number (3418200).

Almost surely, 2^83989640 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 83989640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109382400).

83989640 is an abundant number, since it is smaller than the sum of its proper divisors (134775160).

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

83989640 is a wasteful number, since it uses less digits than its factorization.

83989640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3894 (or 3890 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 83989640 is about 9164.5861881484. The cubic root of 83989640 is about 437.9339085587.

The spelling of 83989640 in words is "eighty-three million, nine hundred eighty-nine thousand, six hundred forty".