82861973 has 4 divisors (see below), whose sum is σ = 84220428. Its totient is φ = 81503520.

The previous prime is 82861969. The next prime is 82861979. The reversal of 82861973 is 37916828.

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 12687844 + 70174129 = 3562^2 + 8377^2 .

It is a cyclic number.

It is not a de Polignac number, because 82861973 - 2² = 82861969 is a prime.

It is a super-2 number, since 2×82861973² = 13732213138905458, 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 (82861979) 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, 679136 + ... + 679257.

It is an arithmetic number, because the mean of its divisors is an integer number (21055107).

Almost surely, 2^82861973 is an apocalyptic number.

It is an amenable number.

82861973 is a deficient number, since it is larger than the sum of its proper divisors (1358455).

82861973 is a wasteful number, since it uses less digits than its factorization.

82861973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1358454.

The product of its digits is 145152, while the sum is 44.

The square root of 82861973 is about 9102.8552114158. The cubic root of 82861973 is about 435.9651323714.

The spelling of 82861973 in words is "eighty-two million, eight hundred sixty-one thousand, nine hundred seventy-three".