428165680 has 20 divisors (see below), whose sum is σ = 995485392. Its totient is φ = 171266240.

The previous prime is 428165671. The next prime is 428165719. The reversal of 428165680 is 86561824.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2675956 + ... + 2676115.

Almost surely, 2^428165680 is an apocalyptic number.

428165680 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

428165680 is an abundant number, since it is smaller than the sum of its proper divisors (567319712).

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

428165680 is a wasteful number, since it uses less digits than its factorization.

428165680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5352084 (or 5352078 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 428165680 is about 20692.1647006784. The cubic root of 428165680 is about 753.7094335935.

The spelling of 428165680 in words is "four hundred twenty-eight million, one hundred sixty-five thousand, six hundred eighty".