47663813 has 4 divisors (see below), whose sum is σ = 47745600. Its totient is φ = 47582028.

The previous prime is 47663809. The next prime is 47663839. The reversal of 47663813 is 31836674.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31836674 = 2 ⋅15918337.

It is a cyclic number.

It is not a de Polignac number, because 47663813 - 2² = 47663809 is a prime.

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 (47663873) 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, 40013 + ... + 41186.

It is an arithmetic number, because the mean of its divisors is an integer number (11936400).

Almost surely, 2^47663813 is an apocalyptic number.

It is an amenable number.

47663813 is a deficient number, since it is larger than the sum of its proper divisors (81787).

47663813 is an equidigital number, since it uses as much as digits as its factorization.

47663813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81786.

The product of its digits is 72576, while the sum is 38.

The square root of 47663813 is about 6903.8983914887. The cubic root of 47663813 is about 362.5736684206.

The spelling of 47663813 in words is "forty-seven million, six hundred sixty-three thousand, eight hundred thirteen".