428628481 has 4 divisors (see below), whose sum is σ = 428708932. Its totient is φ = 428548032.

The previous prime is 428628469. The next prime is 428628511. The reversal of 428628481 is 184826824.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 191961025 + 236667456 = 13855^2 + 15384^2 .

It is a cyclic number.

It is not a de Polignac number, because 428628481 - 2¹¹ = 428626433 is a prime.

It is a super-2 number, since 2×428628481² = 367444749448734722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428628401) 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 3 ways as a sum of consecutive naturals, for example, 31620 + ... + 43093.

It is an arithmetic number, because the mean of its divisors is an integer number (107177233).

Almost surely, 2^428628481 is an apocalyptic number.

It is an amenable number.

428628481 is a deficient number, since it is larger than the sum of its proper divisors (80451).

428628481 is an equidigital number, since it uses as much as digits as its factorization.

428628481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80450.

The product of its digits is 196608, while the sum is 43.

The square root of 428628481 is about 20703.3446814760. The cubic root of 428628481 is about 753.9808953922.

The spelling of 428628481 in words is "four hundred twenty-eight million, six hundred twenty-eight thousand, four hundred eighty-one".