83191220 has 96 divisors (see below), whose sum is σ = 207916800. Its totient is φ = 27941760.

The previous prime is 83191211. The next prime is 83191231. The reversal of 83191220 is 2219138.

It is a self number, because there is not a number n which added to its sum of digits gives 83191220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 459530 + ... + 459710.

It is an arithmetic number, because the mean of its divisors is an integer number (2165800).

Almost surely, 2^83191220 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 83191220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103958400).

83191220 is an abundant number, since it is smaller than the sum of its proper divisors (124725580).

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

83191220 is a wasteful number, since it uses less digits than its factorization.

83191220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278 (or 262 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 83191220 is about 9120.9221025070. The cubic root of 83191220 is about 436.5417962267.

The spelling of 83191220 in words is "eighty-three million, one hundred ninety-one thousand, two hundred twenty".