428664481 has 4 divisors (see below), whose sum is σ = 489902272. Its totient is φ = 367426692.

The previous prime is 428664433. The next prime is 428664493. The reversal of 428664481 is 184466824.

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 428664481 - 2²³ = 420275873 is a prime.

It is a super-2 number, since 2×428664481² = 367506474541998722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428664421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30618885 + ... + 30618898.

It is an arithmetic number, because the mean of its divisors is an integer number (122475568).

Almost surely, 2^428664481 is an apocalyptic number.

It is an amenable number.

428664481 is a deficient number, since it is larger than the sum of its proper divisors (61237791).

428664481 is an equidigital number, since it uses as much as digits as its factorization.

428664481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61237790.

The product of its digits is 294912, while the sum is 43.

The square root of 428664481 is about 20704.2140879580. The cubic root of 428664481 is about 754.0020034563.

The spelling of 428664481 in words is "four hundred twenty-eight million, six hundred sixty-four thousand, four hundred eighty-one".