84128820 has 24 divisors (see below), whose sum is σ = 235560864. Its totient is φ = 22434336.

The previous prime is 84128819. The next prime is 84128833. The reversal of 84128820 is 2882148.

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 701014 + ... + 701133.

It is an arithmetic number, because the mean of its divisors is an integer number (9815036).

Almost surely, 2^84128820 is an apocalyptic number.

It is an amenable number.

84128820 is an abundant number, since it is smaller than the sum of its proper divisors (151432044).

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

84128820 is a wasteful number, since it uses less digits than its factorization.

84128820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1402159 (or 1402157 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 33.

The square root of 84128820 is about 9172.1764047580. The cubic root of 84128820 is about 438.1756764899.

It can be divided in two parts, 84128 and 820, that added together give a palindrome (84948).

The spelling of 84128820 in words is "eighty-four million, one hundred twenty-eight thousand, eight hundred twenty".