428505085908 has 144 divisors (see below), whose sum is σ = 1174346933760. Its totient is φ = 131217795072.

The previous prime is 428505085871. The next prime is 428505085949. The reversal of 428505085908 is 809580505824.

It is a happy number.

428505085908 is a `hidden beast` number, since 4 + 2 + 85 + 0 + 508 + 59 + 0 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 46285216 + ... + 46294472.

It is an arithmetic number, because the mean of its divisors is an integer number (8155187040).

Almost surely, 2^428505085908 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 428505085908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (587173466880).

428505085908 is an abundant number, since it is smaller than the sum of its proper divisors (745841847852).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

428505085908 is a wasteful number, since it uses less digits than its factorization.

428505085908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11086 (or 11081 counting only the distinct ones).

The product of its (nonzero) digits is 4608000, while the sum is 54.

The spelling of 428505085908 in words is "four hundred twenty-eight billion, five hundred five million, eighty-five thousand, nine hundred eight".