328428641 has 4 divisors (see below), whose sum is σ = 328521732. Its totient is φ = 328335552.

The previous prime is 328428629. The next prime is 328428643. The reversal of 328428641 is 146824823.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 146824823 = 2161 ⋅67943.

It can be written as a sum of positive squares in 2 ways, for example, as 201753616 + 126675025 = 14204^2 + 11255^2 .

It is a cyclic number.

It is not a de Polignac number, because 328428641 - 2⁶ = 328428577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 328428595 and 328428604.

It is not an unprimeable number, because it can be changed into a prime (328428643) 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, 41036 + ... + 48381.

It is an arithmetic number, because the mean of its divisors is an integer number (82130433).

Almost surely, 2^328428641 is an apocalyptic number.

It is an amenable number.

328428641 is a deficient number, since it is larger than the sum of its proper divisors (93091).

328428641 is an equidigital number, since it uses as much as digits as its factorization.

328428641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93090.

The product of its digits is 73728, while the sum is 38.

The square root of 328428641 is about 18122.6002825202. The cubic root of 328428641 is about 689.9437334220.

The spelling of 328428641 in words is "three hundred twenty-eight million, four hundred twenty-eight thousand, six hundred forty-one".