428017917 has 4 divisors (see below), whose sum is σ = 570690560. Its totient is φ = 285345276.

The previous prime is 428017913. The next prime is 428017939. The reversal of 428017917 is 719710824.

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 not a de Polignac number, because 428017917 - 2² = 428017913 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 (428017913) 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, 71336317 + ... + 71336322.

It is an arithmetic number, because the mean of its divisors is an integer number (142672640).

Almost surely, 2^428017917 is an apocalyptic number.

It is an amenable number.

428017917 is a deficient number, since it is larger than the sum of its proper divisors (142672643).

428017917 is a wasteful number, since it uses less digits than its factorization.

428017917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142672642.

The product of its (nonzero) digits is 28224, while the sum is 39.

The square root of 428017917 is about 20688.5938864873. The cubic root of 428017917 is about 753.6227201348.

The spelling of 428017917 in words is "four hundred twenty-eight million, seventeen thousand, nine hundred seventeen".