82404257 has 4 divisors (see below), whose sum is σ = 88743060. Its totient is φ = 76065456.

The previous prime is 82404247. The next prime is 82404263. The reversal of 82404257 is 75240428.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39488656 + 42915601 = 6284^2 + 6551^2 .

It is a cyclic number.

It is not a de Polignac number, because 82404257 - 2⁸ = 82404001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82404227) 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 in 3 ways as a sum of consecutive naturals, for example, 3169382 + ... + 3169407.

It is an arithmetic number, because the mean of its divisors is an integer number (22185765).

Almost surely, 2^82404257 is an apocalyptic number.

It is an amenable number.

82404257 is a deficient number, since it is larger than the sum of its proper divisors (6338803).

82404257 is a wasteful number, since it uses less digits than its factorization.

82404257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6338802.

The product of its (nonzero) digits is 17920, while the sum is 32.

The square root of 82404257 is about 9077.6790535907. The cubic root of 82404257 is about 435.1609163766.

The spelling of 82404257 in words is "eighty-two million, four hundred four thousand, two hundred fifty-seven".