84428717609 has 4 divisors (see below), whose sum is σ = 85175874516. Its totient is φ = 83681560704.

The previous prime is 84428717587. The next prime is 84428717657. The reversal of 84428717609 is 90671782448.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13736543209 + 70692174400 = 117203^2 + 265880^2 .

It is a cyclic number.

It is not a de Polignac number, because 84428717609 - 2²⁸ = 84160282153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84428707609) 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, 373578284 + ... + 373578509.

It is an arithmetic number, because the mean of its divisors is an integer number (21293968629).

Almost surely, 2^84428717609 is an apocalyptic number.

It is an amenable number.

84428717609 is a deficient number, since it is larger than the sum of its proper divisors (747156907).

84428717609 is a wasteful number, since it uses less digits than its factorization.

84428717609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 747156906.

The product of its (nonzero) digits is 5419008, while the sum is 56.

The spelling of 84428717609 in words is "eighty-four billion, four hundred twenty-eight million, seven hundred seventeen thousand, six hundred nine".