84480821 has 4 divisors (see below), whose sum is σ = 88927200. Its totient is φ = 80034444.

The previous prime is 84480811. The next prime is 84480833. The reversal of 84480821 is 12808448.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 84480821 - 2⁶ = 84480757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84480811) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2223161 + ... + 2223198.

It is an arithmetic number, because the mean of its divisors is an integer number (22231800).

Almost surely, 2^84480821 is an apocalyptic number.

It is an amenable number.

84480821 is a deficient number, since it is larger than the sum of its proper divisors (4446379).

84480821 is a wasteful number, since it uses less digits than its factorization.

84480821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4446378.

The product of its (nonzero) digits is 16384, while the sum is 35.

The square root of 84480821 is about 9191.3448961509. The cubic root of 84480821 is about 438.7859455998.

The spelling of 84480821 in words is "eighty-four million, four hundred eighty thousand, eight hundred twenty-one".