428493281 has 4 divisors (see below), whose sum is σ = 429373632. Its totient is φ = 427612932.

The previous prime is 428493277. The next prime is 428493293. The reversal of 428493281 is 182394824.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 428493281 - 2² = 428493277 is a prime.

It is a super-2 number, since 2×428493281² = 367212983724289922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428493251) 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 3 ways as a sum of consecutive naturals, for example, 439445 + ... + 440418.

It is an arithmetic number, because the mean of its divisors is an integer number (107343408).

Almost surely, 2^428493281 is an apocalyptic number.

It is an amenable number.

428493281 is a deficient number, since it is larger than the sum of its proper divisors (880351).

428493281 is an equidigital number, since it uses as much as digits as its factorization.

428493281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880350.

The product of its digits is 110592, while the sum is 41.

The square root of 428493281 is about 20700.0792510560. The cubic root of 428493281 is about 753.9016123290.

The spelling of 428493281 in words is "four hundred twenty-eight million, four hundred ninety-three thousand, two hundred eighty-one".