428555438999 has 16 divisors (see below), whose sum is σ = 453293568000. Its totient is φ = 404037240480.

The previous prime is 428555438989. The next prime is 428555439043. The reversal of 428555438999 is 999834555824.

It is not a de Polignac number, because 428555438999 - 2²⁰ = 428554390423 is a prime.

It is a super-2 number, since 2×428555438999² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428555438989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9719894 + ... + 9763884.

It is an arithmetic number, because the mean of its divisors is an integer number (28330848000).

Almost surely, 2^428555438999 is an apocalyptic number.

428555438999 is a deficient number, since it is larger than the sum of its proper divisors (24738129001).

428555438999 is a wasteful number, since it uses less digits than its factorization.

428555438999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46478.

The product of its digits is 559872000, while the sum is 71.

The spelling of 428555438999 in words is "four hundred twenty-eight billion, five hundred fifty-five million, four hundred thirty-eight thousand, nine hundred ninety-nine".