82001805 has 32 divisors (see below), whose sum is σ = 136712448. Its totient is φ = 41932800.

The previous prime is 82001791. The next prime is 82001807. The reversal of 82001805 is 50810028.

It is not a de Polignac number, because 82001805 - 2¹⁰ = 82000781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82001807) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38365 + ... + 40445.

It is an arithmetic number, because the mean of its divisors is an integer number (4272264).

Almost surely, 2^82001805 is an apocalyptic number.

It is an amenable number.

82001805 is a deficient number, since it is larger than the sum of its proper divisors (54710643).

82001805 is a wasteful number, since it uses less digits than its factorization.

82001805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2197.

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 82001805 is about 9055.4848020412. The cubic root of 82001805 is about 434.4513362726.

The spelling of 82001805 in words is "eighty-two million, one thousand, eight hundred five".