378728621550 has 72 divisors (see below), whose sum is σ = 1018953566280. Its totient is φ = 100851768000.

The previous prime is 378728621549. The next prime is 378728621639. The reversal of 378728621550 is 55126827873.

378728621550 is a `hidden beast` number, since 3 + 7 + 8 + 7 + 2 + 8 + 621 + 5 + 5 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 274476 + ... + 912575.

It is an arithmetic number, because the mean of its divisors is an integer number (14152132865).

Almost surely, 2^378728621550 is an apocalyptic number.

378728621550 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

378728621550 is an abundant number, since it is smaller than the sum of its proper divisors (640224944730).

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

378728621550 is a wasteful number, since it uses less digits than its factorization.

378728621550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1187778 (or 1187770 counting only the distinct ones).

The product of its (nonzero) digits is 5644800, while the sum is 54.

The spelling of 378728621550 in words is "three hundred seventy-eight billion, seven hundred twenty-eight million, six hundred twenty-one thousand, five hundred fifty".