83891912 has 32 divisors (see below), whose sum is σ = 170244480. Its totient is φ = 38525760.

The previous prime is 83891909. The next prime is 83891963. The reversal of 83891912 is 21919838.

It is a self number, because there is not a number n which added to its sum of digits gives 83891912.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20033 + ... + 23855.

It is an arithmetic number, because the mean of its divisors is an integer number (5320140).

Almost surely, 2^83891912 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 83891912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85122240).

83891912 is an abundant number, since it is smaller than the sum of its proper divisors (86352568).

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

83891912 is a wasteful number, since it uses less digits than its factorization.

83891912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4053 (or 4049 counting only the distinct ones).

The product of its digits is 31104, while the sum is 41.

The square root of 83891912 is about 9159.2528079533. The cubic root of 83891912 is about 437.7639867468.

It can be divided in two parts, 8389 and 1912, that added together give a palindrome (10301).

The spelling of 83891912 in words is "eighty-three million, eight hundred ninety-one thousand, nine hundred twelve".