504128331 has 24 divisors (see below), whose sum is σ = 835202784. Its totient is φ = 287038080.

The previous prime is 504128323. The next prime is 504128341. The reversal of 504128331 is 133821405.

It is a happy number.

504128331 is a `hidden beast` number, since 504 + 128 + 3 + 31 = 666.

It is not a de Polignac number, because 504128331 - 2³ = 504128323 is a prime.

It is a super-2 number, since 2×504128331² = 508290748233691122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 504128295 and 504128304.

It is not an unprimeable number, because it can be changed into a prime (504128321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3465 + ... + 31941.

It is an arithmetic number, because the mean of its divisors is an integer number (34800116).

Almost surely, 2^504128331 is an apocalyptic number.

504128331 is a deficient number, since it is larger than the sum of its proper divisors (331074453).

504128331 is a wasteful number, since it uses less digits than its factorization.

504128331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28771 (or 28768 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 504128331 is about 22452.8022972635. The cubic root of 504128331 is about 795.8789803434.

Adding to 504128331 its reverse (133821405), we get a palindrome (637949736).

The spelling of 504128331 in words is "five hundred four million, one hundred twenty-eight thousand, three hundred thirty-one".