421264286728 has 8 divisors (see below), whose sum is σ = 789870537630. Its totient is φ = 210632143360.

The previous prime is 421264286701. The next prime is 421264286747. The reversal of 421264286728 is 827682462124.

It can be written as a sum of positive squares in only one way, i.e., 395593197444 + 25671089284 = 628962^2 + 160222^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26329017913 + ... + 26329017928.

Almost surely, 2^421264286728 is an apocalyptic number.

It is an amenable number.

421264286728 is a deficient number, since it is larger than the sum of its proper divisors (368606250902).

421264286728 is a wasteful number, since it uses less digits than its factorization.

421264286728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52658035847 (or 52658035843 counting only the distinct ones).

The product of its digits is 4128768, while the sum is 52.

The spelling of 421264286728 in words is "four hundred twenty-one billion, two hundred sixty-four million, two hundred eighty-six thousand, seven hundred twenty-eight".