391678013888 has 28 divisors (see below), whose sum is σ = 888269782512. Its totient is φ = 167862005760.

The previous prime is 391678013887. The next prime is 391678013921. The reversal of 391678013888 is 888310876193.

It is a tau number, because it is divible by the number of its divisors (28).

It is a self number, because there is not a number n which added to its sum of digits gives 391678013888.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391678013887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 437140193 + ... + 437141088.

It is an arithmetic number, because the mean of its divisors is an integer number (31723920804).

Almost surely, 2^391678013888 is an apocalyptic number.

It is an amenable number.

391678013888 is an abundant number, since it is smaller than the sum of its proper divisors (496591768624).

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

391678013888 is an equidigital number, since it uses as much as digits as its factorization.

391678013888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874281300 (or 874281290 counting only the distinct ones).

The product of its (nonzero) digits is 13934592, while the sum is 62.

The spelling of 391678013888 in words is "three hundred ninety-one billion, six hundred seventy-eight million, thirteen thousand, eight hundred eighty-eight".