428168587431 has 32 divisors (see below), whose sum is σ = 630952172032. Its totient is φ = 256652530560.

The previous prime is 428168587403. The next prime is 428168587459. The reversal of 428168587431 is 134785861824.

It is an interprime number because it is at equal distance from previous prime (428168587403) and next prime (428168587459).

It is not a de Polignac number, because 428168587431 - 2¹⁹ = 428168063143 is a prime.

It is a super-2 number, since 2×428168587431² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428168587481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 628645 + ... + 1118718.

It is an arithmetic number, because the mean of its divisors is an integer number (19717255376).

Almost surely, 2^428168587431 is an apocalyptic number.

428168587431 is a deficient number, since it is larger than the sum of its proper divisors (202783584601).

428168587431 is a wasteful number, since it uses less digits than its factorization.

428168587431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1747543.

The product of its digits is 10321920, while the sum is 57.

The spelling of 428168587431 in words is "four hundred twenty-eight billion, one hundred sixty-eight million, five hundred eighty-seven thousand, four hundred thirty-one".