428575521 has 8 divisors (see below), whose sum is σ = 623382624. Its totient is φ = 259742720.

The previous prime is 428575519. The next prime is 428575523. The reversal of 428575521 is 125575824.

It is an interprime number because it is at equal distance from previous prime (428575519) and next prime (428575523).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 428575521 - 2¹ = 428575519 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 428575521.

It is not an unprimeable number, because it can be changed into a prime (428575523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6493536 + ... + 6493601.

It is an arithmetic number, because the mean of its divisors is an integer number (77922828).

Almost surely, 2^428575521 is an apocalyptic number.

It is an amenable number.

428575521 is a deficient number, since it is larger than the sum of its proper divisors (194807103).

428575521 is a wasteful number, since it uses less digits than its factorization.

428575521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12987151.

The product of its digits is 112000, while the sum is 39.

The square root of 428575521 is about 20702.0656215751. The cubic root of 428575521 is about 753.9498409362.

The spelling of 428575521 in words is "four hundred twenty-eight million, five hundred seventy-five thousand, five hundred twenty-one".