378728621555 has 12 divisors (see below), whose sum is σ = 479652982272. Its totient is φ = 287036427600.

The previous prime is 378728621549. The next prime is 378728621639. The reversal of 378728621555 is 555126827873.

It is not a de Polignac number, because 378728621555 - 2²⁴ = 378711844339 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 378728621494 and 378728621503.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 104909171 + ... + 104912780.

It is an arithmetic number, because the mean of its divisors is an integer number (39971081856).

Almost surely, 2^378728621555 is an apocalyptic number.

378728621555 is a deficient number, since it is larger than the sum of its proper divisors (100924360717).

378728621555 is a wasteful number, since it uses less digits than its factorization.

378728621555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209821994 (or 209821975 counting only the distinct ones).

The product of its digits is 28224000, while the sum is 59.

The spelling of 378728621555 in words is "three hundred seventy-eight billion, seven hundred twenty-eight million, six hundred twenty-one thousand, five hundred fifty-five".