428886721 has 8 divisors (see below), whose sum is σ = 440944704. Its totient is φ = 416853360.

The previous prime is 428886707. The next prime is 428886739. The reversal of 428886721 is 127688824.

It is a happy number.

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 428886721 - 2¹³ = 428878529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428886701) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 32526 + ... + 43768.

It is an arithmetic number, because the mean of its divisors is an integer number (55118088).

Almost surely, 2^428886721 is an apocalyptic number.

It is an amenable number.

428886721 is a deficient number, since it is larger than the sum of its proper divisors (12057983).

428886721 is a wasteful number, since it uses less digits than its factorization.

428886721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12311.

The product of its digits is 344064, while the sum is 46.

The square root of 428886721 is about 20709.5804158365. The cubic root of 428886721 is about 754.1322844121.

The spelling of 428886721 in words is "four hundred twenty-eight million, eight hundred eighty-six thousand, seven hundred twenty-one".