428778669 has 8 divisors (see below), whose sum is σ = 623678112. Its totient is φ = 259865840.

The previous prime is 428778661. The next prime is 428778739. The reversal of 428778669 is 966877824.

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 428778669 - 2³ = 428778661 is a prime.

It is a super-2 number, since 2×428778669² = 367702293978823122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428778661) 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, 6496614 + ... + 6496679.

It is an arithmetic number, because the mean of its divisors is an integer number (77959764).

Almost surely, 2^428778669 is an apocalyptic number.

It is an amenable number.

428778669 is a deficient number, since it is larger than the sum of its proper divisors (194899443).

428778669 is a wasteful number, since it uses less digits than its factorization.

428778669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12993307.

The product of its digits is 8128512, while the sum is 57.

The square root of 428778669 is about 20706.9715072002. The cubic root of 428778669 is about 754.0689480721.

The spelling of 428778669 in words is "four hundred twenty-eight million, seven hundred seventy-eight thousand, six hundred sixty-nine".