428757309 has 12 divisors (see below), whose sum is σ = 619661952. Its totient is φ = 285678600.

The previous prime is 428757281. The next prime is 428757313. The reversal of 428757309 is 903757824.

It is not a de Polignac number, because 428757309 - 2²⁸ = 160321853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428757389) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5044 + ... + 29714.

It is an arithmetic number, because the mean of its divisors is an integer number (51638496).

Almost surely, 2^428757309 is an apocalyptic number.

It is an amenable number.

428757309 is a deficient number, since it is larger than the sum of its proper divisors (190904643).

428757309 is a wasteful number, since it uses less digits than its factorization.

428757309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26608 (or 26605 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The square root of 428757309 is about 20706.4557324521. The cubic root of 428757309 is about 754.0564263203.

The spelling of 428757309 in words is "four hundred twenty-eight million, seven hundred fifty-seven thousand, three hundred nine".