391378894848 has 210 divisors, whose sum is σ = 1173599812539. Its totient is φ = 130459631616.

The previous prime is 391378894831. The next prime is 391378894883. The reversal of 391378894848 is 848498873193.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is a Jordan-Polya number, since it can be written as (4!)⁶ ⋅ (2!)¹¹.

391378894848 is a `hidden beast` number, since 3 + 9 + 137 + 8 + 8 + 9 + 484 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 195689447424 + 195689447424 = 442368^2 + 442368^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=442368.

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

It is a nialpdrome in base 8.

It is a zygodrome in base 8.

It is an unprimeable number.

It is a polite number, since it can be written in 6 ways as a sum of consecutive naturals, for example, 130459631615 + 130459631616 + 130459631617.

Almost surely, 2^391378894848 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 391378894848

391378894848 is an abundant number, since it is smaller than the sum of its proper divisors (782220917691).

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

391378894848 is an frugal number, since it uses more digits than its factorization.

391378894848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76 (or 5 counting only the distinct ones).

The product of its digits is 334430208, while the sum is 72.

Multiplying 391378894848 by its sum of digits (72), we get a 8-th power (28179280429056 = 48⁸).

391378894848 divided by its sum of digits (72) gives a square (5435817984 = 73728²).

The spelling of 391378894848 in words is "three hundred ninety-one billion, three hundred seventy-eight million, eight hundred ninety-four thousand, eight hundred forty-eight".