43978068738 has 18 divisors (see below), whose sum is σ = 95287743369. Its totient is φ = 14659059672.

The previous prime is 43978068727. The next prime is 43978068773. The reversal of 43978068738 is 83786087934.

43978068738 is a `hidden beast` number, since 439 + 78 + 0 + 68 + 73 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 43385973849 + 592094889 = 208293^2 + 24333^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=148287.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 865008 + ... + 914436.

Almost surely, 2^43978068738 is an apocalyptic number.

43978068738 is an abundant number, since it is smaller than the sum of its proper divisors (51309674631).

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

43978068738 is an frugal number, since it uses more digits than its factorization.

43978068738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98866 (or 49434 counting only the distinct ones).

The product of its (nonzero) digits is 48771072, while the sum is 63.

The spelling of 43978068738 in words is "forty-three billion, nine hundred seventy-eight million, sixty-eight thousand, seven hundred thirty-eight".