428765697 has 16 divisors (see below), whose sum is σ = 635592000. Its totient is φ = 285671232.

The previous prime is 428765683. The next prime is 428765699. The reversal of 428765697 is 796567824.

428765697 is a `hidden beast` number, since 4 + 2 + 8 + 76 + 569 + 7 = 666.

It is not a de Polignac number, because 428765697 - 2¹⁰ = 428764673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (428765699) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53754 + ... + 61212.

It is an arithmetic number, because the mean of its divisors is an integer number (39724500).

Almost surely, 2^428765697 is an apocalyptic number.

It is an amenable number.

428765697 is a deficient number, since it is larger than the sum of its proper divisors (206826303).

428765697 is a wasteful number, since it uses less digits than its factorization.

428765697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9597 (or 9591 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 54.

The square root of 428765697 is about 20706.6582769891. The cubic root of 428765697 is about 754.0613436196.

The spelling of 428765697 in words is "four hundred twenty-eight million, seven hundred sixty-five thousand, six hundred ninety-seven".