84728449 has 4 divisors (see below), whose sum is σ = 91246036. Its totient is φ = 78210864.

The previous prime is 84728437. The next prime is 84728461. The reversal of 84728449 is 94482748.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (84728437) and next prime (84728461).

It can be written as a sum of positive squares in 2 ways, for example, as 31438449 + 53290000 = 5607^2 + 7300^2 .

It is a cyclic number.

It is not a de Polignac number, because 84728449 - 2¹⁷ = 84597377 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 84728399 and 84728408.

It is not an unprimeable number, because it can be changed into a prime (84728419) 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, 3258774 + ... + 3258799.

It is an arithmetic number, because the mean of its divisors is an integer number (22811509).

Almost surely, 2^84728449 is an apocalyptic number.

It is an amenable number.

84728449 is a deficient number, since it is larger than the sum of its proper divisors (6517587).

84728449 is a wasteful number, since it uses less digits than its factorization.

84728449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6517586.

The product of its digits is 516096, while the sum is 46.

The square root of 84728449 is about 9204.8057556909. The cubic root of 84728449 is about 439.2142467395.

The spelling of 84728449 in words is "eighty-four million, seven hundred twenty-eight thousand, four hundred forty-nine".