428647220 has 96 divisors (see below), whose sum is σ = 997180800. Its totient is φ = 154151424.

The previous prime is 428647181. The next prime is 428647237. The reversal of 428647220 is 22746824.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 604226 + ... + 604934.

It is an arithmetic number, because the mean of its divisors is an integer number (10387300).

Almost surely, 2^428647220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 428647220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (498590400).

428647220 is an abundant number, since it is smaller than the sum of its proper divisors (568533580).

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

428647220 is a wasteful number, since it uses less digits than its factorization.

428647220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817 (or 815 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 35.

The square root of 428647220 is about 20703.7972362560. The cubic root of 428647220 is about 753.9918828734.

The spelling of 428647220 in words is "four hundred twenty-eight million, six hundred forty-seven thousand, two hundred twenty".