428640530 has 8 divisors (see below), whose sum is σ = 771552972. Its totient is φ = 171456208.

The previous prime is 428640497. The next prime is 428640539. The reversal of 428640530 is 35046824.

It can be written as a sum of positive squares in 2 ways, for example, as 416200801 + 12439729 = 20401^2 + 3527^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (428640539) 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, 21432017 + ... + 21432036.

Almost surely, 2^428640530 is an apocalyptic number.

428640530 is a deficient number, since it is larger than the sum of its proper divisors (342912442).

428640530 is a wasteful number, since it uses less digits than its factorization.

428640530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42864060.

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 428640530 is about 20703.6356710603. The cubic root of 428640530 is about 753.9879602756.

The spelling of 428640530 in words is "four hundred twenty-eight million, six hundred forty thousand, five hundred thirty".