391268942887680 has 864 divisors, whose sum is σ = 1629210324635712. Its totient is φ = 85421142835200.

The previous prime is 391268942887679. The next prime is 391268942887687. The reversal of 391268942887680 is 86788249862193.

391268942887680 is a `hidden beast` number, since 3 + 9 + 1 + 268 + 9 + 4 + 288 + 76 + 8 + 0 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 391268942887680.

It is not an unprimeable number, because it can be changed into a prime (391268942887687) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 64645264 + ... + 70438256.

It is an arithmetic number, because the mean of its divisors is an integer number (1885660097958).

Almost surely, 2^{391268942887680} is an apocalyptic number.

391268942887680 is a gapful number since it is divisible by the number (30) 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 391268942887680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (814605162317856).

391268942887680 is an abundant number, since it is smaller than the sum of its proper divisors (1237941381748032).

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

391268942887680 is a wasteful number, since it uses less digits than its factorization.

391268942887680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5793085 (or 5793068 counting only the distinct ones).

The product of its (nonzero) digits is 4013162496, while the sum is 81.

The spelling of 391268942887680 in words is "three hundred ninety-one trillion, two hundred sixty-eight billion, nine hundred forty-two million, eight hundred eighty-seven thousand, six hundred eighty".