428820646 has 8 divisors (see below), whose sum is σ = 643488120. Its totient is φ = 214324608.

The previous prime is 428820641. The next prime is 428820647. The reversal of 428820646 is 646028824.

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

It is a junction number, because it is equal to n+sod(n) for n = 428820599 and 428820608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428820641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36411 + ... + 46726.

It is an arithmetic number, because the mean of its divisors is an integer number (80436015).

Almost surely, 2^428820646 is an apocalyptic number.

428820646 is a deficient number, since it is larger than the sum of its proper divisors (214667474).

428820646 is a wasteful number, since it uses less digits than its factorization.

428820646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85718.

The product of its (nonzero) digits is 147456, while the sum is 40.

The square root of 428820646 is about 20707.9850782253. The cubic root of 428820646 is about 754.0935547994.

The spelling of 428820646 in words is "four hundred twenty-eight million, eight hundred twenty thousand, six hundred forty-six".