328978994 has 4 divisors (see below), whose sum is σ = 493468494. Its totient is φ = 164489496.

The previous prime is 328978981. The next prime is 328979009. The reversal of 328978994 is 499879823.

328978994 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 499879823 = 421 ⋅1187363.

It can be written as a sum of positive squares in only one way, i.e., 190798969 + 138180025 = 13813^2 + 11755^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82244747 + ... + 82244750.

Almost surely, 2^328978994 is an apocalyptic number.

328978994 is a deficient number, since it is larger than the sum of its proper divisors (164489500).

328978994 is a wasteful number, since it uses less digits than its factorization.

328978994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164489499.

The product of its digits is 7838208, while the sum is 59.

The square root of 328978994 is about 18137.7780888399. The cubic root of 328978994 is about 690.3289015191.

The spelling of 328978994 in words is "three hundred twenty-eight million, nine hundred seventy-eight thousand, nine hundred ninety-four".