328991664 has 20 divisors (see below), whose sum is σ = 849895256. Its totient is φ = 109663872.

The previous prime is 328991653. The next prime is 328991671. The reversal of 328991664 is 466199823.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 6853993 = 328991664 / (3 + 2 + 8 + 9 + 9 + 1 + 6 + 6 + 4).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3426949 + ... + 3427044.

Almost surely, 2^328991664 is an apocalyptic number.

It is an amenable number.

328991664 is an abundant number, since it is smaller than the sum of its proper divisors (520903592).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

328991664 is a wasteful number, since it uses less digits than its factorization.

328991664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6854004 (or 6853998 counting only the distinct ones).

The product of its digits is 559872, while the sum is 48.

The square root of 328991664 is about 18138.1273564831. The cubic root of 328991664 is about 690.3377636400.

The spelling of 328991664 in words is "three hundred twenty-eight million, nine hundred ninety-one thousand, six hundred sixty-four".