428443751 has 4 divisors (see below), whose sum is σ = 430687104. Its totient is φ = 426200400.

The previous prime is 428443733. The next prime is 428443811. The reversal of 428443751 is 157344824.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 428443751 - 2¹⁰ = 428442727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428443721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1121390 + ... + 1121771.

It is an arithmetic number, because the mean of its divisors is an integer number (107671776).

Almost surely, 2^428443751 is an apocalyptic number.

428443751 is a deficient number, since it is larger than the sum of its proper divisors (2243353).

428443751 is a wasteful number, since it uses less digits than its factorization.

428443751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2243352.

The product of its digits is 107520, while the sum is 38.

The square root of 428443751 is about 20698.8828442503. The cubic root of 428443751 is about 753.8725631098.

The spelling of 428443751 in words is "four hundred twenty-eight million, four hundred forty-three thousand, seven hundred fifty-one".