83143840 has 96 divisors (see below), whose sum is σ = 214897536. Its totient is φ = 30213120.

The previous prime is 83143831. The next prime is 83143843. The reversal of 83143840 is 4834138.

It is not an unprimeable number, because it can be changed into a prime (83143843) 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, 147399 + ... + 147961.

It is an arithmetic number, because the mean of its divisors is an integer number (2238516).

Almost surely, 2^83143840 is an apocalyptic number.

83143840 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 83143840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107448768).

83143840 is an abundant number, since it is smaller than the sum of its proper divisors (131753696).

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

83143840 is a wasteful number, since it uses less digits than its factorization.

83143840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662 (or 654 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 83143840 is about 9118.3244074775. The cubic root of 83143840 is about 436.4589057560.

Adding to 83143840 its reverse (4834138), we get a palindrome (87977978).

The spelling of 83143840 in words is "eighty-three million, one hundred forty-three thousand, eight hundred forty".