82105520 has 40 divisors (see below), whose sum is σ = 218167584. Its totient is φ = 28150272.

The previous prime is 82105519. The next prime is 82105531. The reversal of 82105520 is 2550128.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72749 + ... + 73868.

Almost surely, 2^82105520 is an apocalyptic number.

82105520 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

82105520 is an abundant number, since it is smaller than the sum of its proper divisors (136062064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

82105520 is a wasteful number, since it uses less digits than its factorization.

82105520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146637 (or 146631 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 82105520 is about 9061.2096322732. The cubic root of 82105520 is about 434.6344222299.

Adding to 82105520 its reverse (2550128), we get a palindrome (84655648).

The spelling of 82105520 in words is "eighty-two million, one hundred five thousand, five hundred twenty".