47713781 has 4 divisors (see below), whose sum is σ = 50520492. Its totient is φ = 44907072.

The previous prime is 47713777. The next prime is 47713843. The reversal of 47713781 is 18731774.

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 13256881 + 34456900 = 3641^2 + 5870^2 .

It is a cyclic number.

It is not a de Polignac number, because 47713781 - 2² = 47713777 is a prime.

It is a super-2 number, since 2×47713781² = 4553209794631922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47713741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1403330 + ... + 1403363.

It is an arithmetic number, because the mean of its divisors is an integer number (12630123).

Almost surely, 2^47713781 is an apocalyptic number.

It is an amenable number.

47713781 is a deficient number, since it is larger than the sum of its proper divisors (2806711).

47713781 is a wasteful number, since it uses less digits than its factorization.

47713781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2806710.

The product of its digits is 32928, while the sum is 38.

The square root of 47713781 is about 6907.5162685295. The cubic root of 47713781 is about 362.7003246310.

The spelling of 47713781 in words is "forty-seven million, seven hundred thirteen thousand, seven hundred eighty-one".