391991275116288 has 432 divisors, whose sum is σ = 1142642103482880. Its totient is φ = 129233702707200.

The previous prime is 391991275116281. The next prime is 391991275116377. The reversal of 391991275116288 is 882611572199193.

391991275116288 is a `hidden beast` number, since 3 + 9 + 1 + 9 + 9 + 1 + 27 + 511 + 6 + 2 + 88 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391991275116281) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 135029717845 + ... + 135029720747.

Almost surely, 2^{391991275116288} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391991275116288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (571321051741440).

391991275116288 is an abundant number, since it is smaller than the sum of its proper divisors (750650828366592).

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

391991275116288 is a wasteful number, since it uses less digits than its factorization.

391991275116288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4396 (or 4379 counting only the distinct ones).

The product of its digits is 117573120, while the sum is 72.

The spelling of 391991275116288 in words is "three hundred ninety-one trillion, nine hundred ninety-one billion, two hundred seventy-five million, one hundred sixteen thousand, two hundred eighty-eight".