82705919 has 4 divisors (see below), whose sum is σ = 83125944. Its totient is φ = 82285896.

The previous prime is 82705891. The next prime is 82705921. The reversal of 82705919 is 91950728.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82705919 is a prime.

It is a super-2 number, since 2×82705919² = 13680538075269122, 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 (82755919) 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, 209717 + ... + 210110.

It is an arithmetic number, because the mean of its divisors is an integer number (20781486).

Almost surely, 2^82705919 is an apocalyptic number.

82705919 is a deficient number, since it is larger than the sum of its proper divisors (420025).

82705919 is a wasteful number, since it uses less digits than its factorization.

82705919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420024.

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 82705919 is about 9094.2794656861. The cubic root of 82705919 is about 435.6912759224.

The spelling of 82705919 in words is "eighty-two million, seven hundred five thousand, nine hundred nineteen".