428428431 has 12 divisors (see below), whose sum is σ = 619075080. Its totient is φ = 285510960.

The previous prime is 428428423. The next prime is 428428447. The reversal of 428428431 is 134824824.

It is not a de Polignac number, because 428428431 - 2³ = 428428423 is a prime.

It is a super-2 number, since 2×428428431² = 367101840978243522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428428411) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21600 + ... + 36378.

It is an arithmetic number, because the mean of its divisors is an integer number (51589590).

Almost surely, 2^428428431 is an apocalyptic number.

428428431 is a deficient number, since it is larger than the sum of its proper divisors (190646649).

428428431 is a wasteful number, since it uses less digits than its factorization.

428428431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18006 (or 18003 counting only the distinct ones).

The product of its digits is 49152, while the sum is 36.

The square root of 428428431 is about 20698.5127726607. The cubic root of 428428431 is about 753.8635775154.

The spelling of 428428431 in words is "four hundred twenty-eight million, four hundred twenty-eight thousand, four hundred thirty-one".