82157180 has 24 divisors (see below), whose sum is σ = 197177568. Its totient is φ = 28168128.

The previous prime is 82157171. The next prime is 82157221. The reversal of 82157180 is 8175128.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 293279 + ... + 293558.

It is an arithmetic number, because the mean of its divisors is an integer number (8215732).

Almost surely, 2^82157180 is an apocalyptic number.

It is an amenable number.

82157180 is an abundant number, since it is smaller than the sum of its proper divisors (115020388).

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

82157180 is a wasteful number, since it uses less digits than its factorization.

82157180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586853 (or 586851 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 82157180 is about 9064.0597968019. The cubic root of 82157180 is about 434.7255590450.

The spelling of 82157180 in words is "eighty-two million, one hundred fifty-seven thousand, one hundred eighty".