428505085909 has 8 divisors (see below), whose sum is σ = 430573599872. Its totient is φ = 426440155680.

The previous prime is 428505085871. The next prime is 428505085949. The reversal of 428505085909 is 909580505824.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 428505085909 - 2¹⁷ = 428504954837 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 428505085909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428505085949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 656064 + ... + 1134649.

It is an arithmetic number, because the mean of its divisors is an integer number (53821699984).

Almost surely, 2^428505085909 is an apocalyptic number.

It is an amenable number.

428505085909 is a deficient number, since it is larger than the sum of its proper divisors (2068513963).

428505085909 is a wasteful number, since it uses less digits than its factorization.

428505085909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1791867.

The product of its (nonzero) digits is 5184000, while the sum is 55.

The spelling of 428505085909 in words is "four hundred twenty-eight billion, five hundred five million, eighty-five thousand, nine hundred nine".