428404805 has 4 divisors (see below), whose sum is σ = 514085772. Its totient is φ = 342723840.

The previous prime is 428404783. The next prime is 428404813. The reversal of 428404805 is 508404824.

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

It can be written as a sum of positive squares in 2 ways, for example, as 168324676 + 260080129 = 12974^2 + 16127^2 .

It is not a de Polignac number, because 428404805 - 2²⁰ = 427356229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42840476 + ... + 42840485.

It is an arithmetic number, because the mean of its divisors is an integer number (128521443).

Almost surely, 2^428404805 is an apocalyptic number.

It is an amenable number.

428404805 is a deficient number, since it is larger than the sum of its proper divisors (85680967).

428404805 is an equidigital number, since it uses as much as digits as its factorization.

428404805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85680966.

The product of its (nonzero) digits is 40960, while the sum is 35.

The square root of 428404805 is about 20697.9420474597. The cubic root of 428404805 is about 753.8497198074.

The spelling of 428404805 in words is "four hundred twenty-eight million, four hundred four thousand, eight hundred five".