84205520 has 60 divisors (see below), whose sum is σ = 227752164. Its totient is φ = 28869120.

The previous prime is 84205477. The next prime is 84205577. The reversal of 84205520 is 2550248.

It can be written as a sum of positive squares in 2 ways, for example, as 45914176 + 38291344 = 6776^2 + 6188^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 84205520.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6821 + ... + 14660.

Almost surely, 2^84205520 is an apocalyptic number.

84205520 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

84205520 is an abundant number, since it is smaller than the sum of its proper divisors (143546644).

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

84205520 is a wasteful number, since it uses less digits than its factorization.

84205520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21508 (or 21495 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 84205520 is about 9176.3565754607. The cubic root of 84205520 is about 438.3087972053.

Adding to 84205520 its reverse (2550248), we get a palindrome (86755768).

The spelling of 84205520 in words is "eighty-four million, two hundred five thousand, five hundred twenty".