428217984255 has 32 divisors (see below), whose sum is σ = 733032368640. Its totient is φ = 212815831680.

The previous prime is 428217984251. The next prime is 428217984301. The reversal of 428217984255 is 552489712824.

It is not a de Polignac number, because 428217984255 - 2² = 428217984251 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a junction number, because it is equal to n+sod(n) for n = 428217984195 and 428217984204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428217984251) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12298347 + ... + 12333116.

It is an arithmetic number, because the mean of its divisors is an integer number (22907261520).

Almost surely, 2^428217984255 is an apocalyptic number.

428217984255 is a deficient number, since it is larger than the sum of its proper divisors (304814384385).

428217984255 is a wasteful number, since it uses less digits than its factorization.

428217984255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24631551.

The product of its digits is 12902400, while the sum is 57.

The spelling of 428217984255 in words is "four hundred twenty-eight billion, two hundred seventeen million, nine hundred eighty-four thousand, two hundred fifty-five".