82722817 has 4 divisors (see below), whose sum is σ = 82882116. Its totient is φ = 82563520.

The previous prime is 82722803. The next prime is 82722839. The reversal of 82722817 is 71822728.

It is a happy number.

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 26532801 + 56190016 = 5151^2 + 7496^2 .

It is a cyclic number.

It is not a de Polignac number, because 82722817 - 2²³ = 74334209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82722217) 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, 78868 + ... + 79909.

It is an arithmetic number, because the mean of its divisors is an integer number (20720529).

It is a Proth number, since it is equal to 5049 ⋅ 2¹⁴ + 1 and 5049 < 2¹⁴.

Almost surely, 2^82722817 is an apocalyptic number.

It is an amenable number.

82722817 is a deficient number, since it is larger than the sum of its proper divisors (159299).

82722817 is a wasteful number, since it uses less digits than its factorization.

82722817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159298.

The product of its digits is 25088, while the sum is 37.

The square root of 82722817 is about 9095.2084638011. The cubic root of 82722817 is about 435.7209465510.

The spelling of 82722817 in words is "eighty-two million, seven hundred twenty-two thousand, eight hundred seventeen".