63640989378 has 54 divisors (see below), whose sum is σ = 139552654059. Its totient is φ = 20960716032.

The previous prime is 63640989337. The next prime is 63640989403. The reversal of 63640989378 is 87398904636.

63640989378 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 5 ways, for example, as 2350089 + 63638639289 = 1533^2 + 252267^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=178383.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 103818600 + ... + 103819212.

Almost surely, 2^63640989378 is an apocalyptic number.

63640989378 is an abundant number, since it is smaller than the sum of its proper divisors (75911664681).

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

63640989378 is an frugal number, since it uses more digits than its factorization.

63640989378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1428 (or 715 counting only the distinct ones).

The product of its (nonzero) digits is 47029248, while the sum is 63.

The spelling of 63640989378 in words is "sixty-three billion, six hundred forty million, nine hundred eighty-nine thousand, three hundred seventy-eight".