82805805 has 24 divisors (see below), whose sum is σ = 148162560. Its totient is φ = 42737760.

The previous prime is 82805803. The next prime is 82805881. The reversal of 82805805 is 50850828.

It is not a de Polignac number, because 82805805 - 2¹ = 82805803 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 82805805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82805803) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28285 + ... + 31074.

It is an arithmetic number, because the mean of its divisors is an integer number (6173440).

Almost surely, 2^82805805 is an apocalyptic number.

It is an amenable number.

82805805 is a deficient number, since it is larger than the sum of its proper divisors (65356755).

82805805 is a wasteful number, since it uses less digits than its factorization.

82805805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59401 (or 59398 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 36.

The square root of 82805805 is about 9099.7695025753. The cubic root of 82805805 is about 435.8666037635.

The spelling of 82805805 in words is "eighty-two million, eight hundred five thousand, eight hundred five".