82643957 has 16 divisors (see below), whose sum is σ = 92387520. Its totient is φ = 73296000.

The previous prime is 82643947. The next prime is 82643969. The reversal of 82643957 is 75934628.

It is a cyclic number.

It is not a de Polignac number, because 82643957 - 2²² = 78449653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82643947) 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, 80594 + ... + 81612.

It is an arithmetic number, because the mean of its divisors is an integer number (5774220).

Almost surely, 2^82643957 is an apocalyptic number.

It is an amenable number.

82643957 is a deficient number, since it is larger than the sum of its proper divisors (9743563).

82643957 is a wasteful number, since it uses less digits than its factorization.

82643957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1204.

The product of its digits is 362880, while the sum is 44.

The square root of 82643957 is about 9090.8721803796. The cubic root of 82643957 is about 435.5824443429.

It can be divided in two parts, 8264 and 3957, that added together give a palindrome (12221).

The spelling of 82643957 in words is "eighty-two million, six hundred forty-three thousand, nine hundred fifty-seven".