84128799 has 4 divisors (see below), whose sum is σ = 112171736. Its totient is φ = 56085864.

The previous prime is 84128791. The next prime is 84128809. The reversal of 84128799 is 99782148.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 84128799 - 2³ = 84128791 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 (84128791) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 14021464 + ... + 14021469.

It is an arithmetic number, because the mean of its divisors is an integer number (28042934).

Almost surely, 2^84128799 is an apocalyptic number.

84128799 is a deficient number, since it is larger than the sum of its proper divisors (28042937).

84128799 is a wasteful number, since it uses less digits than its factorization.

84128799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28042936.

The product of its digits is 290304, while the sum is 48.

The square root of 84128799 is about 9172.1752599915. The cubic root of 84128799 is about 438.1756400312.

The spelling of 84128799 in words is "eighty-four million, one hundred twenty-eight thousand, seven hundred ninety-nine".