428724005 has 4 divisors (see below), whose sum is σ = 514468812. Its totient is φ = 342979200.

The previous prime is 428724001. The next prime is 428724029. The reversal of 428724005 is 500427824.

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 91891396 + 336832609 = 9586^2 + 18353^2 .

It is not a de Polignac number, because 428724005 - 2² = 428724001 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 (428724001) 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, 42872396 + ... + 42872405.

It is an arithmetic number, because the mean of its divisors is an integer number (128617203).

Almost surely, 2^428724005 is an apocalyptic number.

It is an amenable number.

428724005 is a deficient number, since it is larger than the sum of its proper divisors (85744807).

428724005 is an equidigital number, since it uses as much as digits as its factorization.

428724005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85744806.

The product of its (nonzero) digits is 17920, while the sum is 32.

The square root of 428724005 is about 20705.6515231953. The cubic root of 428724005 is about 754.0369018753.

The spelling of 428724005 in words is "four hundred twenty-eight million, seven hundred twenty-four thousand, five".