428905087217 has 4 divisors (see below), whose sum is σ = 429476199936. Its totient is φ = 428333974500.

The previous prime is 428905087211. The next prime is 428905087241. The reversal of 428905087217 is 712780509824.

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 a cyclic number.

It is not a de Polignac number, because 428905087217 - 2¹² = 428905083121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428905087211) 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, 285555233 + ... + 285556734.

It is an arithmetic number, because the mean of its divisors is an integer number (107369049984).

Almost surely, 2^428905087217 is an apocalyptic number.

It is an amenable number.

428905087217 is a deficient number, since it is larger than the sum of its proper divisors (571112719).

428905087217 is an equidigital number, since it uses as much as digits as its factorization.

428905087217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571112718.

The product of its (nonzero) digits is 2257920, while the sum is 53.

The spelling of 428905087217 in words is "four hundred twenty-eight billion, nine hundred five million, eighty-seven thousand, two hundred seventeen".