328791638 has 16 divisors (see below), whose sum is σ = 564737184. Its totient is φ = 140637120.

The previous prime is 328791629. The next prime is 328791641. The reversal of 328791638 is 836197823.

It is a junction number, because it is equal to n+sod(n) for n = 328791592 and 328791601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15245 + ... + 29832.

It is an arithmetic number, because the mean of its divisors is an integer number (35296074).

Almost surely, 2^328791638 is an apocalyptic number.

328791638 is a deficient number, since it is larger than the sum of its proper divisors (235945546).

328791638 is a wasteful number, since it uses less digits than its factorization.

328791638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45607.

The product of its digits is 435456, while the sum is 47.

The square root of 328791638 is about 18132.6125530768. The cubic root of 328791638 is about 690.1978274742.

The spelling of 328791638 in words is "three hundred twenty-eight million, seven hundred ninety-one thousand, six hundred thirty-eight".