428521599 has 24 divisors (see below), whose sum is σ = 676166400. Its totient is φ = 259356240.

The previous prime is 428521553. The next prime is 428521631. The reversal of 428521599 is 995125824.

It is a happy number.

428521599 is a `hidden beast` number, since 4 + 2 + 8 + 52 + 1 + 599 = 666.

It is not a de Polignac number, because 428521599 - 2¹² = 428517503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428521529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82522 + ... + 87560.

It is an arithmetic number, because the mean of its divisors is an integer number (28173600).

Almost surely, 2^428521599 is an apocalyptic number.

428521599 is a deficient number, since it is larger than the sum of its proper divisors (247644801).

428521599 is a wasteful number, since it uses less digits than its factorization.

428521599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5915 (or 5912 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 428521599 is about 20700.7632467984. The cubic root of 428521599 is about 753.9182197583.

The spelling of 428521599 in words is "four hundred twenty-eight million, five hundred twenty-one thousand, five hundred ninety-nine".