428775861 has 4 divisors (see below), whose sum is σ = 571701152. Its totient is φ = 285850572.

The previous prime is 428775803. The next prime is 428775889. The reversal of 428775861 is 168577824.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 428775861 - 2⁹ = 428775349 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 428775861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428775961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71462641 + ... + 71462646.

It is an arithmetic number, because the mean of its divisors is an integer number (142925288).

Almost surely, 2^428775861 is an apocalyptic number.

It is an amenable number.

428775861 is a deficient number, since it is larger than the sum of its proper divisors (142925291).

428775861 is a wasteful number, since it uses less digits than its factorization.

428775861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142925290.

The product of its digits is 752640, while the sum is 48.

The square root of 428775861 is about 20706.9037038375. The cubic root of 428775861 is about 754.0673019779.

The spelling of 428775861 in words is "four hundred twenty-eight million, seven hundred seventy-five thousand, eight hundred sixty-one".