82487857 has 2 divisors, whose sum is σ = 82487858. Its totient is φ = 82487856.

The previous prime is 82487849. The next prime is 82487863. The reversal of 82487857 is 75878428.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79584241 + 2903616 = 8921^2 + 1704^2 .

It is a cyclic number.

It is not a de Polignac number, because 82487857 - 2³ = 82487849 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 82487857.

It is not a weakly prime, because it can be changed into another prime (82487357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41243928 + 41243929.

It is an arithmetic number, because the mean of its divisors is an integer number (41243929).

Almost surely, 2^82487857 is an apocalyptic number.

It is an amenable number.

82487857 is a deficient number, since it is larger than the sum of its proper divisors (1).

82487857 is an equidigital number, since it uses as much as digits as its factorization.

82487857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1003520, while the sum is 49.

The square root of 82487857 is about 9082.2825875437. The cubic root of 82487857 is about 435.3080251078.

The spelling of 82487857 in words is "eighty-two million, four hundred eighty-seven thousand, eight hundred fifty-seven".