328478809 has 4 divisors (see below), whose sum is σ = 328746880. Its totient is φ = 328210740.

The previous prime is 328478779. The next prime is 328478827. The reversal of 328478809 is 908874823.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 908874823 = 19 ⋅47835517.

It is a cyclic number.

It is not a de Polignac number, because 328478809 - 2¹⁹ = 327954521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (328478869) 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, 132189 + ... + 134650.

It is an arithmetic number, because the mean of its divisors is an integer number (82186720).

Almost surely, 2^328478809 is an apocalyptic number.

It is an amenable number.

328478809 is a deficient number, since it is larger than the sum of its proper divisors (268071).

328478809 is a wasteful number, since it uses less digits than its factorization.

328478809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268070.

The product of its (nonzero) digits is 774144, while the sum is 49.

The square root of 328478809 is about 18123.9843577509. The cubic root of 328478809 is about 689.9788616363.

The spelling of 328478809 in words is "three hundred twenty-eight million, four hundred seventy-eight thousand, eight hundred nine".