84090920 has 16 divisors (see below), whose sum is σ = 189204660. Its totient is φ = 33636352.

The previous prime is 84090911. The next prime is 84090931. The reversal of 84090920 is 2909048.

It can be written as a sum of positive squares in 2 ways, for example, as 78605956 + 5484964 = 8866^2 + 2342^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1051097 + ... + 1051176.

Almost surely, 2^84090920 is an apocalyptic number.

It is an amenable number.

84090920 is an abundant number, since it is smaller than the sum of its proper divisors (105113740).

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

84090920 is a wasteful number, since it uses less digits than its factorization.

84090920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2102284 (or 2102280 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 84090920 is about 9170.1101411052. The cubic root of 84090920 is about 438.1098672839.

Adding to 84090920 its reverse (2909048), we get a palindrome (86999968).

The spelling of 84090920 in words is "eighty-four million, ninety thousand, nine hundred twenty".