47047781 has 8 divisors (see below), whose sum is σ = 54026400. Its totient is φ = 40519440.

The previous prime is 47047771. The next prime is 47047783. The reversal of 47047781 is 18774074.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 47047781 - 2⁶ = 47047717 is a prime.

It is a super-2 number, since 2×47047781² = 4426987394047922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47047783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112346 + ... + 112763.

It is an arithmetic number, because the mean of its divisors is an integer number (6753300).

Almost surely, 2^47047781 is an apocalyptic number.

47047781 is the 3068-th centered decagonal number.

It is an amenable number.

47047781 is a deficient number, since it is larger than the sum of its proper divisors (6978619).

47047781 is a wasteful number, since it uses less digits than its factorization.

47047781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225139.

The product of its (nonzero) digits is 43904, while the sum is 38.

The square root of 47047781 is about 6859.1385027567. The cubic root of 47047781 is about 361.0048597295.

The spelling of 47047781 in words is "forty-seven million, forty-seven thousand, seven hundred eighty-one".