428668749 has 24 divisors (see below), whose sum is σ = 643968000. Its totient is φ = 274448160.

The previous prime is 428668741. The next prime is 428668847. The reversal of 428668749 is 947866824.

It is not a de Polignac number, because 428668749 - 2³ = 428668741 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 428668695 and 428668704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428668741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45552 + ... + 54150.

It is an arithmetic number, because the mean of its divisors is an integer number (26832000).

Almost surely, 2^428668749 is an apocalyptic number.

It is an amenable number.

428668749 is a deficient number, since it is larger than the sum of its proper divisors (215299251).

428668749 is a wasteful number, since it uses less digits than its factorization.

428668749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8825 (or 8822 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 54.

The square root of 428668749 is about 20704.3171585059. The cubic root of 428668749 is about 754.0045058562.

It can be divided in two parts, 42866 and 8749, that added together give a palindrome (51615).

The spelling of 428668749 in words is "four hundred twenty-eight million, six hundred sixty-eight thousand, seven hundred forty-nine".