47890781938 has 4 divisors (see below), whose sum is σ = 71836172910. Its totient is φ = 23945390968.

The previous prime is 47890781921. The next prime is 47890781947. The reversal of 47890781938 is 83918709874.

It is a happy number.

47890781938 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 35782640569 + 12108141369 = 189163^2 + 110037^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 47890781938.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11972695483 + ... + 11972695486.

Almost surely, 2^47890781938 is an apocalyptic number.

47890781938 is a deficient number, since it is larger than the sum of its proper divisors (23945390972).

47890781938 is a wasteful number, since it uses less digits than its factorization.

47890781938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23945390971.

The product of its (nonzero) digits is 24385536, while the sum is 64.

The spelling of 47890781938 in words is "forty-seven billion, eight hundred ninety million, seven hundred eighty-one thousand, nine hundred thirty-eight".