82921705 has 4 divisors (see below), whose sum is σ = 99506052. Its totient is φ = 66337360.

The previous prime is 82921697. The next prime is 82921717. The reversal of 82921705 is 50712928.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8737936 + 74183769 = 2956^2 + 8613^2 .

It is not a de Polignac number, because 82921705 - 2³ = 82921697 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8292166 + ... + 8292175.

It is an arithmetic number, because the mean of its divisors is an integer number (24876513).

Almost surely, 2^82921705 is an apocalyptic number.

It is an amenable number.

82921705 is a deficient number, since it is larger than the sum of its proper divisors (16584347).

82921705 is a wasteful number, since it uses less digits than its factorization.

82921705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16584346.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 82921705 is about 9106.1355689447. The cubic root of 82921705 is about 436.0698640254.

The spelling of 82921705 in words is "eighty-two million, nine hundred twenty-one thousand, seven hundred five".