328428640 has 48 divisors (see below), whose sum is σ = 787519152. Its totient is φ = 129406464.

The previous prime is 328428629. The next prime is 328428643. The reversal of 328428640 is 46824823.

It is a self number, because there is not a number n which added to its sum of digits gives 328428640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328428643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4599 + ... + 26038.

It is an arithmetic number, because the mean of its divisors is an integer number (16406649).

Almost surely, 2^328428640 is an apocalyptic number.

It is an amenable number.

328428640 is an abundant number, since it is smaller than the sum of its proper divisors (459090512).

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

328428640 is a wasteful number, since it uses less digits than its factorization.

328428640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30719 (or 30711 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 37.

The square root of 328428640 is about 18122.6002549303. The cubic root of 328428640 is about 689.9437327218.

The spelling of 328428640 in words is "three hundred twenty-eight million, four hundred twenty-eight thousand, six hundred forty".