428928805 has 4 divisors (see below), whose sum is σ = 514714572. Its totient is φ = 343143040.

The previous prime is 428928793. The next prime is 428928809. The reversal of 428928805 is 508829824.

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 330403329 + 98525476 = 18177^2 + 9926^2 .

It is a de Polignac number, because none of the positive numbers 2^k-428928805 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 (428928809) 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, 42892876 + ... + 42892885.

It is an arithmetic number, because the mean of its divisors is an integer number (128678643).

Almost surely, 2^428928805 is an apocalyptic number.

It is an amenable number.

428928805 is a deficient number, since it is larger than the sum of its proper divisors (85785767).

428928805 is an equidigital number, since it uses as much as digits as its factorization.

428928805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85785766.

The product of its (nonzero) digits is 368640, while the sum is 46.

The square root of 428928805 is about 20710.5964424012. The cubic root of 428928805 is about 754.1569497169.

The spelling of 428928805 in words is "four hundred twenty-eight million, nine hundred twenty-eight thousand, eight hundred five".