82157707 has 4 divisors (see below), whose sum is σ = 82186096. Its totient is φ = 82129320.

The previous prime is 82157701. The next prime is 82157717. The reversal of 82157707 is 70775128.

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

It is a cyclic number.

It is not a de Polignac number, because 82157707 - 2¹¹ = 82155659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82157701) 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, 9288 + ... + 15829.

It is an arithmetic number, because the mean of its divisors is an integer number (20546524).

Almost surely, 2^82157707 is an apocalyptic number.

82157707 is a deficient number, since it is larger than the sum of its proper divisors (28389).

82157707 is a wasteful number, since it uses less digits than its factorization.

82157707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28388.

The product of its (nonzero) digits is 27440, while the sum is 37.

The square root of 82157707 is about 9064.0888676138. The cubic root of 82157707 is about 434.7264885636.

The spelling of 82157707 in words is "eighty-two million, one hundred fifty-seven thousand, seven hundred seven".