428250321 has 28 divisors (see below), whose sum is σ = 659476852. Its totient is φ = 277766496.

The previous prime is 428250311. The next prime is 428250341. The reversal of 428250321 is 123052824.

It can be written as a sum of positive squares in 2 ways, for example, as 415548225 + 12702096 = 20385^2 + 3564^2 .

It is not a de Polignac number, because 428250321 - 2¹¹ = 428248273 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428250311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 19035 + ... + 34911.

Almost surely, 2^428250321 is an apocalyptic number.

It is an amenable number.

428250321 is a deficient number, since it is larger than the sum of its proper divisors (231226531).

428250321 is an equidigital number, since it uses as much as digits as its factorization.

428250321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15932 (or 15917 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 428250321 is about 20694.2098423690. The cubic root of 428250321 is about 753.7590954572.

The spelling of 428250321 in words is "four hundred twenty-eight million, two hundred fifty thousand, three hundred twenty-one".