391604640336 has 320 divisors, whose sum is σ = 1456262348800. Its totient is φ = 97844350464.

The previous prime is 391604640313. The next prime is 391604640391. The reversal of 391604640336 is 633046406193.

391604640336 is a `hidden beast` number, since 3 + 9 + 1 + 604 + 6 + 4 + 0 + 3 + 36 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 391604640291 and 391604640300.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 484785 + ... + 1009071.

It is an arithmetic number, because the mean of its divisors is an integer number (4550819840).

Almost surely, 2^391604640336 is an apocalyptic number.

391604640336 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391604640336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (728131174400).

391604640336 is an abundant number, since it is smaller than the sum of its proper divisors (1064657708464).

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

391604640336 is a wasteful number, since it uses less digits than its factorization.

391604640336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524343 (or 524331 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 45.

The spelling of 391604640336 in words is "three hundred ninety-one billion, six hundred four million, six hundred forty thousand, three hundred thirty-six".