47665791 has 12 divisors (see below), whose sum is σ = 69377880. Its totient is φ = 31533840.

The previous prime is 47665777. The next prime is 47665811. The reversal of 47665791 is 19756674.

It is a happy number.

47665791 is a `hidden beast` number, since 4 + 76 + 6 + 579 + 1 = 666.

It is not a de Polignac number, because 47665791 - 2⁶ = 47665727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47665771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19036 + ... + 21393.

It is an arithmetic number, because the mean of its divisors is an integer number (5781490).

Almost surely, 2^47665791 is an apocalyptic number.

47665791 is a deficient number, since it is larger than the sum of its proper divisors (21712089).

47665791 is a wasteful number, since it uses less digits than its factorization.

47665791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40566 (or 40563 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 47665791 is about 6904.0416424005. The cubic root of 47665791 is about 362.5786838314.

The spelling of 47665791 in words is "forty-seven million, six hundred sixty-five thousand, seven hundred ninety-one".