83991288 has 64 divisors (see below), whose sum is σ = 227797920. Its totient is φ = 25702400.

The previous prime is 83991283. The next prime is 83991289. The reversal of 83991288 is 88219938.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83991283) 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, 14218 + ... + 19238.

Almost surely, 2^83991288 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 83991288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113898960).

83991288 is an abundant number, since it is smaller than the sum of its proper divisors (143806632).

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

83991288 is a wasteful number, since it uses less digits than its factorization.

83991288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5088 (or 5084 counting only the distinct ones).

The product of its digits is 248832, while the sum is 48.

The square root of 83991288 is about 9164.6760990228. The cubic root of 83991288 is about 437.9367728420.

The spelling of 83991288 in words is "eighty-three million, nine hundred ninety-one thousand, two hundred eighty-eight".