328785421 has 4 divisors (see below), whose sum is σ = 328858812. Its totient is φ = 328712032.

The previous prime is 328785419. The next prime is 328785449. The reversal of 328785421 is 124587823.

It is a happy number.

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 158482921 + 170302500 = 12589^2 + 13050^2 .

It is a cyclic number.

It is not a de Polignac number, because 328785421 - 2¹ = 328785419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328785461) 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, 29506 + ... + 39091.

It is an arithmetic number, because the mean of its divisors is an integer number (82214703).

Almost surely, 2^328785421 is an apocalyptic number.

It is an amenable number.

328785421 is a deficient number, since it is larger than the sum of its proper divisors (73391).

328785421 is an equidigital number, since it uses as much as digits as its factorization.

328785421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73390.

The product of its digits is 107520, while the sum is 40.

The square root of 328785421 is about 18132.4411208199. The cubic root of 328785421 is about 690.1934772146.

The spelling of 328785421 in words is "three hundred twenty-eight million, seven hundred eighty-five thousand, four hundred twenty-one".