428644081 has 8 divisors (see below), whose sum is σ = 439062624. Its totient is φ = 418246080.

The previous prime is 428644061. The next prime is 428644127. The reversal of 428644081 is 180446824.

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

It is a cyclic number.

It is not a de Polignac number, because 428644081 - 2⁵ = 428644049 is a prime.

It is a super-2 number, since 2×428644081² = 367471496352669122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 428644081.

It is not an unprimeable number, because it can be changed into a prime (428644061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42345 + ... + 51481.

It is an arithmetic number, because the mean of its divisors is an integer number (54882828).

Almost surely, 2^428644081 is an apocalyptic number.

It is an amenable number.

428644081 is a deficient number, since it is larger than the sum of its proper divisors (10418543).

428644081 is a wasteful number, since it uses less digits than its factorization.

428644081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10271.

The product of its (nonzero) digits is 49152, while the sum is 37.

The square root of 428644081 is about 20703.7214287673. The cubic root of 428644081 is about 753.9900423651.

The spelling of 428644081 in words is "four hundred twenty-eight million, six hundred forty-four thousand, eighty-one".