428779009 has 8 divisors (see below), whose sum is σ = 433667520. Its totient is φ = 423904656.

The previous prime is 428778983. The next prime is 428779027. The reversal of 428779009 is 900977824.

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 428779009 - 2¹⁷ = 428647937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 428779009.

It is not an unprimeable number, because it can be changed into a prime (428779069) 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, 64719 + ... + 71035.

It is an arithmetic number, because the mean of its divisors is an integer number (54208440).

Almost surely, 2^428779009 is an apocalyptic number.

It is an amenable number.

428779009 is a deficient number, since it is larger than the sum of its proper divisors (4888511).

428779009 is a wasteful number, since it uses less digits than its factorization.

428779009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7079.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 428779009 is about 20706.9797169940. The cubic root of 428779009 is about 754.0691473850.

The spelling of 428779009 in words is "four hundred twenty-eight million, seven hundred seventy-nine thousand, nine".