391482328640 has 56 divisors (see below), whose sum is σ = 1003926328440. Its totient is φ = 144547319808.

The previous prime is 391482328631. The next prime is 391482328663. The reversal of 391482328640 is 46823284193.

It can be written as a sum of positive squares in 4 ways, for example, as 1227241024 + 390255087616 = 35032^2 + 624704^2 .

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, 47049005 + ... + 47057324.

It is an arithmetic number, because the mean of its divisors is an integer number (17927255865).

Almost surely, 2^391482328640 is an apocalyptic number.

It is an amenable number.

391482328640 is an abundant number, since it is smaller than the sum of its proper divisors (612443999800).

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

391482328640 is a wasteful number, since it uses less digits than its factorization.

391482328640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94106359 (or 94106349 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 50.

The spelling of 391482328640 in words is "three hundred ninety-one billion, four hundred eighty-two million, three hundred twenty-eight thousand, six hundred forty".