8378638372 has 12 divisors (see below), whose sum is σ = 15790510876. Its totient is φ = 3867063840.

The previous prime is 8378638357. The next prime is 8378638379. The reversal of 8378638372 is 2738368738.

It can be written as a sum of positive squares in 2 ways, for example, as 5307705316 + 3070933056 = 72854^2 + 55416^2 .

It is not an unprimeable number, because it can be changed into a prime (8378638379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80563779 + ... + 80563882.

Almost surely, 2^8378638372 is an apocalyptic number.

It is an amenable number.

8378638372 is a deficient number, since it is larger than the sum of its proper divisors (7411872504).

8378638372 is a wasteful number, since it uses less digits than its factorization.

8378638372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161127678 (or 161127676 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 55.

The square root of 8378638372 is about 91534.9024798738. The cubic root of 8378638372 is about 2031.0680857148.

The spelling of 8378638372 in words is "eight billion, three hundred seventy-eight million, six hundred thirty-eight thousand, three hundred seventy-two".