428020646 has 8 divisors (see below), whose sum is σ = 642297600. Its totient is φ = 213921448.

The previous prime is 428020643. The next prime is 428020673. The reversal of 428020646 is 646020824.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428020643) 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, 38246 + ... + 48153.

It is an arithmetic number, because the mean of its divisors is an integer number (80287200).

Almost surely, 2^428020646 is an apocalyptic number.

428020646 is a deficient number, since it is larger than the sum of its proper divisors (214276954).

428020646 is a wasteful number, since it uses less digits than its factorization.

428020646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88878.

The product of its (nonzero) digits is 18432, while the sum is 32.

The square root of 428020646 is about 20688.6598405987. The cubic root of 428020646 is about 753.6243218061.

The spelling of 428020646 in words is "four hundred twenty-eight million, twenty thousand, six hundred forty-six".