82719381 has 4 divisors (see below), whose sum is σ = 110292512. Its totient is φ = 55146252.

The previous prime is 82719361. The next prime is 82719409. The reversal of 82719381 is 18391728.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 82719381 - 2²⁵ = 49164949 is a prime.

It is a super-2 number, since 2×82719381² = 13684991986046322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82719341) 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, 13786561 + ... + 13786566.

It is an arithmetic number, because the mean of its divisors is an integer number (27573128).

Almost surely, 2^82719381 is an apocalyptic number.

It is an amenable number.

82719381 is a deficient number, since it is larger than the sum of its proper divisors (27573131).

82719381 is a wasteful number, since it uses less digits than its factorization.

82719381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27573130.

The product of its digits is 24192, while the sum is 39.

The square root of 82719381 is about 9095.0195711719. The cubic root of 82719381 is about 435.7149137217.

The spelling of 82719381 in words is "eighty-two million, seven hundred nineteen thousand, three hundred eighty-one".