428732509 has 8 divisors (see below), whose sum is σ = 433579392. Its totient is φ = 423904320.

The previous prime is 428732497. The next prime is 428732533. The reversal of 428732509 is 905237824.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-428732509 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 (428732309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44302 + ... + 53104.

It is an arithmetic number, because the mean of its divisors is an integer number (54197424).

Almost surely, 2^428732509 is an apocalyptic number.

It is an amenable number.

428732509 is a deficient number, since it is larger than the sum of its proper divisors (4846883).

428732509 is a wasteful number, since it uses less digits than its factorization.

428732509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9347.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 428732509 is about 20705.8568767390. The cubic root of 428732509 is about 754.0418874351.

The spelling of 428732509 in words is "four hundred twenty-eight million, seven hundred thirty-two thousand, five hundred nine".