82646381 has 4 divisors (see below), whose sum is σ = 83464764. Its totient is φ = 81828000.

The previous prime is 82646363. The next prime is 82646407. The reversal of 82646381 is 18364628.

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 79370281 + 3276100 = 8909^2 + 1810^2 .

It is a cyclic number.

It is not a de Polignac number, because 82646381 - 2¹⁰ = 82645357 is a prime.

It is a super-3 number, since 3×82646381³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82646321) 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, 409040 + ... + 409241.

It is an arithmetic number, because the mean of its divisors is an integer number (20866191).

Almost surely, 2^82646381 is an apocalyptic number.

It is an amenable number.

82646381 is a deficient number, since it is larger than the sum of its proper divisors (818383).

82646381 is a wasteful number, since it uses less digits than its factorization.

82646381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818382.

The product of its digits is 55296, while the sum is 38.

The square root of 82646381 is about 9091.0054999433. The cubic root of 82646381 is about 435.5867029383.

The spelling of 82646381 in words is "eighty-two million, six hundred forty-six thousand, three hundred eighty-one".