428520717 has 48 divisors (see below), whose sum is σ = 685039680. Its totient is φ = 256974336.

The previous prime is 428520689. The next prime is 428520739. The reversal of 428520717 is 717025824.

It is not a de Polignac number, because 428520717 - 2⁸ = 428520461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428520767) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 333358 + ... + 334640.

It is an arithmetic number, because the mean of its divisors is an integer number (14271660).

Almost surely, 2^428520717 is an apocalyptic number.

It is an amenable number.

428520717 is a deficient number, since it is larger than the sum of its proper divisors (256518963).

428520717 is a wasteful number, since it uses less digits than its factorization.

428520717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1402 (or 1399 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

The square root of 428520717 is about 20700.7419432251. The cubic root of 428520717 is about 753.9177025099.

The spelling of 428520717 in words is "four hundred twenty-eight million, five hundred twenty thousand, seven hundred seventeen".