428366689 has 4 divisors (see below), whose sum is σ = 432370224. Its totient is φ = 424363156.

The previous prime is 428366681. The next prime is 428366693. The reversal of 428366689 is 986663824.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 428366689 - 2³ = 428366681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428366681) 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 3 ways as a sum of consecutive naturals, for example, 2001607 + ... + 2001820.

It is an arithmetic number, because the mean of its divisors is an integer number (108092556).

Almost surely, 2^428366689 is an apocalyptic number.

It is an amenable number.

428366689 is a deficient number, since it is larger than the sum of its proper divisors (4003535).

428366689 is a wasteful number, since it uses less digits than its factorization.

428366689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4003534.

The product of its digits is 2985984, while the sum is 52.

The square root of 428366689 is about 20697.0212591088. The cubic root of 428366689 is about 753.8273619908.

The spelling of 428366689 in words is "four hundred twenty-eight million, three hundred sixty-six thousand, six hundred eighty-nine".