428888779 has 16 divisors (see below), whose sum is σ = 473481216. Its totient is φ = 385257600.

The previous prime is 428888753. The next prime is 428888791. The reversal of 428888779 is 977888824.

It is a cyclic number.

It is not a de Polignac number, because 428888779 - 2²¹ = 426791627 is a prime.

It is a super-2 number, since 2×428888779² = 367891169504221682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428888749) 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 15 ways as a sum of consecutive naturals, for example, 470334 + ... + 471244.

It is an arithmetic number, because the mean of its divisors is an integer number (29592576).

Almost surely, 2^428888779 is an apocalyptic number.

428888779 is a deficient number, since it is larger than the sum of its proper divisors (44592437).

428888779 is a wasteful number, since it uses less digits than its factorization.

428888779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1386.

The product of its digits is 14450688, while the sum is 61.

The square root of 428888779 is about 20709.6301029255. The cubic root of 428888779 is about 754.1334906372.

The spelling of 428888779 in words is "four hundred twenty-eight million, eight hundred eighty-eight thousand, seven hundred seventy-nine".