82555220 has 24 divisors (see below), whose sum is σ = 189127008. Its totient is φ = 30020000.

The previous prime is 82555159. The next prime is 82555223. The reversal of 82555220 is 2255528.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82555223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187406 + ... + 187845.

It is an arithmetic number, because the mean of its divisors is an integer number (7880292).

Almost surely, 2^82555220 is an apocalyptic number.

It is an amenable number.

82555220 is an abundant number, since it is smaller than the sum of its proper divisors (106571788).

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

82555220 is a wasteful number, since it uses less digits than its factorization.

82555220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375271 (or 375269 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 29.

The square root of 82555220 is about 9085.9903147648. The cubic root of 82555220 is about 435.4264897193.

The spelling of 82555220 in words is "eighty-two million, five hundred fifty-five thousand, two hundred twenty".