328645 has 4 divisors (see below), whose sum is σ = 394380. Its totient is φ = 262912.

The previous prime is 328639. The next prime is 328651. The reversal of 328645 is 546823.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 546823 = 37 ⋅14779.

It is an interprime number because it is at equal distance from previous prime (328639) and next prime (328651).

It can be written as a sum of positive squares in 2 ways, for example, as 185761 + 142884 = 431^2 + 378^2 .

It is a cyclic number.

It is not a de Polignac number, because 328645 - 2³ = 328637 is a prime.

328645 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32860 + ... + 32869.

It is an arithmetic number, because the mean of its divisors is an integer number (98595).

2³²⁸⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

328645 is a deficient number, since it is larger than the sum of its proper divisors (65735).

328645 is an equidigital number, since it uses as much as digits as its factorization.

328645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65734.

The product of its digits is 5760, while the sum is 28.

The square root of 328645 is about 573.2756753954. The cubic root of 328645 is about 69.0095204955.

The spelling of 328645 in words is "three hundred twenty-eight thousand, six hundred forty-five".