82989257 has 16 divisors (see below), whose sum is σ = 95355792. Its totient is φ = 71546880.

The previous prime is 82989229. The next prime is 82989259. The reversal of 82989257 is 75298928.

It can be written as a sum of positive squares in 8 ways, for example, as 978121 + 82011136 = 989^2 + 9056^2 .

It is not a de Polignac number, because 82989257 - 2⁸ = 82989001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82989259) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28907 + ... + 31647.

It is an arithmetic number, because the mean of its divisors is an integer number (5959737).

Almost surely, 2^82989257 is an apocalyptic number.

It is an amenable number.

82989257 is a deficient number, since it is larger than the sum of its proper divisors (12366535).

82989257 is a wasteful number, since it uses less digits than its factorization.

82989257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2908.

The product of its digits is 725760, while the sum is 50.

The square root of 82989257 is about 9109.8439613420. The cubic root of 82989257 is about 436.1882463635.

The spelling of 82989257 in words is "eighty-two million, nine hundred eighty-nine thousand, two hundred fifty-seven".