478728646428 has 12 divisors (see below), whose sum is σ = 1117033508360. Its totient is φ = 159576215472.

The previous prime is 478728646397. The next prime is 478728646433. The reversal of 478728646428 is 824646827874.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×478728646428² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19947026923 + ... + 19947026946.

Almost surely, 2^478728646428 is an apocalyptic number.

It is an amenable number.

478728646428 is an abundant number, since it is smaller than the sum of its proper divisors (638304861932).

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

478728646428 is a wasteful number, since it uses less digits than its factorization.

478728646428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39894053876 (or 39894053874 counting only the distinct ones).

The product of its digits is 231211008, while the sum is 66.

The spelling of 478728646428 in words is "four hundred seventy-eight billion, seven hundred twenty-eight million, six hundred forty-six thousand, four hundred twenty-eight".