82681669 has 6 divisors (see below), whose sum is σ = 96180774. Its totient is φ = 70869960.

The previous prime is 82681663. The next prime is 82681679. The reversal of 82681669 is 96618628.

It can be written as a sum of positive squares in only one way, i.e., 48024900 + 34656769 = 6930^2 + 5887^2 .

It is not a de Polignac number, because 82681669 - 2⁷ = 82681541 is a prime.

It is a super-2 number, since 2×82681669² = 13672516777251122, 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 (82681663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 843642 + ... + 843739.

It is an arithmetic number, because the mean of its divisors is an integer number (16030129).

Almost surely, 2^82681669 is an apocalyptic number.

It is an amenable number.

82681669 is a deficient number, since it is larger than the sum of its proper divisors (13499105).

82681669 is a wasteful number, since it uses less digits than its factorization.

82681669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1687395 (or 1687388 counting only the distinct ones).

The product of its digits is 248832, while the sum is 46.

The square root of 82681669 is about 9092.9461122345. The cubic root of 82681669 is about 435.6486891024.

The spelling of 82681669 in words is "eighty-two million, six hundred eighty-one thousand, six hundred sixty-nine".