428662217 has 4 divisors (see below), whose sum is σ = 428717520. Its totient is φ = 428606916.

The previous prime is 428662159. The next prime is 428662237. The reversal of 428662217 is 712266824.

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 428662217 - 2¹⁰ = 428661193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428662237) 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, 13667 + ... + 32312.

It is an arithmetic number, because the mean of its divisors is an integer number (107179380).

Almost surely, 2^428662217 is an apocalyptic number.

It is an amenable number.

428662217 is a deficient number, since it is larger than the sum of its proper divisors (55303).

428662217 is an equidigital number, since it uses as much as digits as its factorization.

428662217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55302.

The product of its digits is 64512, while the sum is 38.

The square root of 428662217 is about 20704.1594130262. The cubic root of 428662217 is about 754.0006760284. Note that the first 3 decimals are identical.

The spelling of 428662217 in words is "four hundred twenty-eight million, six hundred sixty-two thousand, two hundred seventeen".