328908981 has 16 divisors (see below), whose sum is σ = 477547200. Its totient is φ = 200567808.

The previous prime is 328908971. The next prime is 328908989. The reversal of 328908981 is 189809823.

It is a happy number.

It is not a de Polignac number, because 328908981 - 2⁵ = 328908949 is a prime.

It is a super-2 number, since 2×328908981² = 216362235564916722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 328908981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328908989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97836 + ... + 101141.

It is an arithmetic number, because the mean of its divisors is an integer number (29846700).

Almost surely, 2^328908981 is an apocalyptic number.

It is an amenable number.

328908981 is a deficient number, since it is larger than the sum of its proper divisors (148638219).

328908981 is a wasteful number, since it uses less digits than its factorization.

328908981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199028.

The product of its (nonzero) digits is 248832, while the sum is 48.

The square root of 328908981 is about 18135.8479537076. The cubic root of 328908981 is about 690.2799263288.

The spelling of 328908981 in words is "three hundred twenty-eight million, nine hundred eight thousand, nine hundred eighty-one".