84128573 has 4 divisors (see below), whose sum is σ = 84146940. Its totient is φ = 84110208.

The previous prime is 84128557. The next prime is 84128647. The reversal of 84128573 is 37582148.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 64432729 + 19695844 = 8027^2 + 4438^2 .

It is a cyclic number.

It is not a de Polignac number, because 84128573 - 2⁴ = 84128557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84128173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3923 + ... + 13551.

It is an arithmetic number, because the mean of its divisors is an integer number (21036735).

Almost surely, 2^84128573 is an apocalyptic number.

It is an amenable number.

84128573 is a deficient number, since it is larger than the sum of its proper divisors (18367).

84128573 is an equidigital number, since it uses as much as digits as its factorization.

84128573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18366.

The product of its digits is 53760, while the sum is 38.

The square root of 84128573 is about 9172.1629401140. The cubic root of 84128573 is about 438.1752476654.

The spelling of 84128573 in words is "eighty-four million, one hundred twenty-eight thousand, five hundred seventy-three".