428641668 has 72 divisors (see below), whose sum is σ = 1333562048. Its totient is φ = 113047488.

The previous prime is 428641649. The next prime is 428641747. The reversal of 428641668 is 866146824.

428641668 is a `hidden beast` number, since 428 + 64 + 166 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62146 + ... + 68697.

Almost surely, 2^428641668 is an apocalyptic number.

It is an amenable number.

428641668 is an abundant number, since it is smaller than the sum of its proper divisors (904920380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

428641668 is a wasteful number, since it uses less digits than its factorization.

428641668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130873 (or 130868 counting only the distinct ones).

The product of its digits is 442368, while the sum is 45.

The square root of 428641668 is about 20703.6631541377. The cubic root of 428641668 is about 753.9886275305.

It can be divided in two parts, 4286 and 41668, that added together give a palindrome (45954).

The spelling of 428641668 in words is "four hundred twenty-eight million, six hundred forty-one thousand, six hundred sixty-eight".