82720371 has 4 divisors (see below), whose sum is σ = 110293832. Its totient is φ = 55146912.

The previous prime is 82720361. The next prime is 82720387. The reversal of 82720371 is 17302728.

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

It is not a de Polignac number, because 82720371 - 2¹⁰ = 82719347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82720321) 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, 13786726 + ... + 13786731.

It is an arithmetic number, because the mean of its divisors is an integer number (27573458).

Almost surely, 2^82720371 is an apocalyptic number.

82720371 is a deficient number, since it is larger than the sum of its proper divisors (27573461).

82720371 is a wasteful number, since it uses less digits than its factorization.

82720371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27573460.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 82720371 is about 9095.0739964005. The cubic root of 82720371 is about 435.7166519522.

The spelling of 82720371 in words is "eighty-two million, seven hundred twenty thousand, three hundred seventy-one".