82643481 has 6 divisors (see below), whose sum is σ = 119373930. Its totient is φ = 55095648.

The previous prime is 82643461. The next prime is 82643497. The reversal of 82643481 is 18434628.

82643481 is a `hidden beast` number, since 8 + 2 + 643 + 4 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 78481881 + 4161600 = 8859^2 + 2040^2 .

It is not a de Polignac number, because 82643481 - 2⁹ = 82642969 is a prime.

It is a super-3 number, since 3×82643481³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (82643441) 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, 4591296 + ... + 4591313.

It is an arithmetic number, because the mean of its divisors is an integer number (19895655).

Almost surely, 2^82643481 is an apocalyptic number.

It is an amenable number.

82643481 is a deficient number, since it is larger than the sum of its proper divisors (36730449).

82643481 is a wasteful number, since it uses less digits than its factorization.

82643481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9182615 (or 9182612 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 82643481 is about 9090.8460002356. The cubic root of 82643481 is about 435.5816080743.

The spelling of 82643481 in words is "eighty-two million, six hundred forty-three thousand, four hundred eighty-one".