82557320 has 16 divisors (see below), whose sum is σ = 185754060. Its totient is φ = 33022912.

The previous prime is 82557317. The next prime is 82557329. The reversal of 82557320 is 2375528.

It can be written as a sum of positive squares in 2 ways, for example, as 69322276 + 13235044 = 8326^2 + 3638^2 .

It is a super-2 number, since 2×82557320² = 13631422171164800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (82557329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1031927 + ... + 1032006.

Almost surely, 2^82557320 is an apocalyptic number.

It is an amenable number.

82557320 is an abundant number, since it is smaller than the sum of its proper divisors (103196740).

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

82557320 is a wasteful number, since it uses less digits than its factorization.

82557320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2063944 (or 2063940 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 82557320 is about 9086.1058765568. The cubic root of 82557320 is about 435.4301817446.

The spelling of 82557320 in words is "eighty-two million, five hundred fifty-seven thousand, three hundred twenty".