428348810821 has 16 divisors (see below), whose sum is σ = 446020162560. Its totient is φ = 410876495680.

The previous prime is 428348810777. The next prime is 428348810831. The reversal of 428348810821 is 128018843824.

It is a cyclic number.

It is not a de Polignac number, because 428348810821 - 2¹⁷ = 428348679749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428348810831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4231626 + ... + 4331668.

It is an arithmetic number, because the mean of its divisors is an integer number (27876260160).

Almost surely, 2^428348810821 is an apocalyptic number.

It is an amenable number.

428348810821 is a deficient number, since it is larger than the sum of its proper divisors (17671351739).

428348810821 is a wasteful number, since it uses less digits than its factorization.

428348810821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101036.

The product of its (nonzero) digits is 786432, while the sum is 49.

The spelling of 428348810821 in words is "four hundred twenty-eight billion, three hundred forty-eight million, eight hundred ten thousand, eight hundred twenty-one".