328638505 has 8 divisors (see below), whose sum is σ = 424702152. Its totient is φ = 242686848.

The previous prime is 328638503. The next prime is 328638517. The reversal of 328638505 is 505836823.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 14356521 + 314281984 = 3789^2 + 17728^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 328638505 - 2¹ = 328638503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (328638503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2527924 + ... + 2528053.

It is an arithmetic number, because the mean of its divisors is an integer number (53087769).

Almost surely, 2^328638505 is an apocalyptic number.

It is an amenable number.

328638505 is a deficient number, since it is larger than the sum of its proper divisors (96063647).

328638505 is a wasteful number, since it uses less digits than its factorization.

328638505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5055995.

The product of its (nonzero) digits is 172800, while the sum is 40.

The square root of 328638505 is about 18128.3894761780. The cubic root of 328638505 is about 690.0906588153.

The spelling of 328638505 in words is "three hundred twenty-eight million, six hundred thirty-eight thousand, five hundred five".