428221447682 has 18 divisors (see below), whose sum is σ = 747214033923. Its totient is φ = 183520701252.

The previous prime is 428221447681. The next prime is 428221447711. The reversal of 428221447682 is 286744122824.

It can be written as a sum of positive squares in only one way, i.e., 214110723841 + 214110723841 = 462721^2 + 462721^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=462721.

It is a self number, because there is not a number n which added to its sum of digits gives 428221447682.

It is not an unprimeable number, because it can be changed into a prime (428221447681) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6445043 + ... + 6511145.

Almost surely, 2^428221447682 is an apocalyptic number.

428221447682 is a deficient number, since it is larger than the sum of its proper divisors (318992586241).

428221447682 is an frugal number, since it uses more digits than its factorization.

428221447682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132222 (or 66112 counting only the distinct ones).

The product of its digits is 2752512, while the sum is 50.

Multiplying 428221447682 by its sum of digits (50), we get a square (21411072384100 = 4627210²).

The spelling of 428221447682 in words is "four hundred twenty-eight billion, two hundred twenty-one million, four hundred forty-seven thousand, six hundred eighty-two".