82156725 has 36 divisors (see below), whose sum is σ = 168176736. Its totient is φ = 37556640.

The previous prime is 82156721. The next prime is 82156747. The reversal of 82156725 is 52765128.

It is a happy number.

It is not a de Polignac number, because 82156725 - 2² = 82156721 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 82156725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82156721) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 24507 + ... + 27656.

It is an arithmetic number, because the mean of its divisors is an integer number (4671576).

Almost surely, 2^82156725 is an apocalyptic number.

It is an amenable number.

82156725 is an abundant number, since it is smaller than the sum of its proper divisors (86020011).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

82156725 is a wasteful number, since it uses less digits than its factorization.

82156725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52186 (or 52178 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 82156725 is about 9064.0346976388. The cubic root of 82156725 is about 434.7247565163.

The spelling of 82156725 in words is "eighty-two million, one hundred fifty-six thousand, seven hundred twenty-five".