1378447728773 has 8 divisors (see below), whose sum is σ = 1384377332448. Its totient is φ = 1372525581744.

The previous prime is 1378447728761. The next prime is 1378447728799. The reversal of 1378447728773 is 3778277448731.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1378447728773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378447728743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1493486 + ... + 2233247.

It is an arithmetic number, because the mean of its divisors is an integer number (173047166556).

Almost surely, 2^{1378447728773} is an apocalyptic number.

It is an amenable number.

1378447728773 is a deficient number, since it is larger than the sum of its proper divisors (5929603675).

1378447728773 is a wasteful number, since it uses less digits than its factorization.

1378447728773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3728323.

The product of its digits is 309786624, while the sum is 68.

The spelling of 1378447728773 in words is "one trillion, three hundred seventy-eight billion, four hundred forty-seven million, seven hundred twenty-eight thousand, seven hundred seventy-three".