378720728643 has 4 divisors (see below), whose sum is σ = 504960971528. Its totient is φ = 252480485760.

The previous prime is 378720728641. The next prime is 378720728677. The reversal of 378720728643 is 346827027873.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 378720728643 - 2¹ = 378720728641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (378720728641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63120121438 + ... + 63120121443.

It is an arithmetic number, because the mean of its divisors is an integer number (126240242882).

Almost surely, 2^378720728643 is an apocalyptic number.

378720728643 is a deficient number, since it is larger than the sum of its proper divisors (126240242885).

378720728643 is a wasteful number, since it uses less digits than its factorization.

378720728643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126240242884.

The product of its (nonzero) digits is 18966528, while the sum is 57.

The spelling of 378720728643 in words is "three hundred seventy-eight billion, seven hundred twenty million, seven hundred twenty-eight thousand, six hundred forty-three".