82857220 has 24 divisors (see below), whose sum is σ = 175959000. Its totient is φ = 32769792.

The previous prime is 82857199. The next prime is 82857227. The reversal of 82857220 is 2275828.

It can be written as a sum of positive squares in 4 ways, for example, as 16662724 + 66194496 = 4082^2 + 8136^2 .

It is a super-2 number, since 2×82857220² = 13730637812256800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (82857227) 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, 21495 + ... + 25054.

It is an arithmetic number, because the mean of its divisors is an integer number (7331625).

Almost surely, 2^82857220 is an apocalyptic number.

It is an amenable number.

82857220 is an abundant number, since it is smaller than the sum of its proper divisors (93101780).

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

82857220 is a wasteful number, since it uses less digits than its factorization.

82857220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46647 (or 46645 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 82857220 is about 9102.5941357395. The cubic root of 82857220 is about 435.9567964934.

The spelling of 82857220 in words is "eighty-two million, eight hundred fifty-seven thousand, two hundred twenty".