428664069 has 10 divisors (see below), whose sum is σ = 640350150. Its totient is φ = 285775992.

The previous prime is 428664043. The next prime is 428664097. The reversal of 428664069 is 960466824.

It can be written as a sum of positive squares in only one way, i.e., 342731169 + 85932900 = 18513^2 + 9270^2 .

It is not a de Polignac number, because 428664069 - 2⁵ = 428664037 is a prime.

It is a super-2 number, since 2×428664069² = 367505768103273522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428664169) 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 9 ways as a sum of consecutive naturals, for example, 2645994 + ... + 2646155.

It is an arithmetic number, because the mean of its divisors is an integer number (64035015).

Almost surely, 2^428664069 is an apocalyptic number.

It is an amenable number.

428664069 is a deficient number, since it is larger than the sum of its proper divisors (211686081).

428664069 is an equidigital number, since it uses as much as digits as its factorization.

428664069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5292161 (or 5292152 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The square root of 428664069 is about 20704.2041382904. The cubic root of 428664069 is about 754.0017618929.

The spelling of 428664069 in words is "four hundred twenty-eight million, six hundred sixty-four thousand, sixty-nine".