47779681 has 4 divisors (see below), whose sum is σ = 48100500. Its totient is φ = 47458864.

The previous prime is 47779657. The next prime is 47779687. The reversal of 47779681 is 18697774.

47779681 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 2 ways, for example, as 28987456 + 18792225 = 5384^2 + 4335^2 .

It is a cyclic number.

It is not a de Polignac number, because 47779681 - 2¹⁷ = 47648609 is a prime.

It is a super-2 number, since 2×47779681² = 4565795832923522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47779687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160186 + ... + 160483.

It is an arithmetic number, because the mean of its divisors is an integer number (12025125).

Almost surely, 2^47779681 is an apocalyptic number.

It is an amenable number.

47779681 is a deficient number, since it is larger than the sum of its proper divisors (320819).

47779681 is a wasteful number, since it uses less digits than its factorization.

47779681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320818.

The product of its digits is 592704, while the sum is 49.

The square root of 47779681 is about 6912.2847886932. The cubic root of 47779681 is about 362.8672292810.

The spelling of 47779681 in words is "forty-seven million, seven hundred seventy-nine thousand, six hundred eighty-one".