47791665 has 24 divisors (see below), whose sum is σ = 83776680. Its totient is φ = 25200384.

The previous prime is 47791661. The next prime is 47791673. The reversal of 47791665 is 56619774.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5489649 + 42302016 = 2343^2 + 6504^2 .

It is not a de Polignac number, because 47791665 - 2² = 47791661 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 47791665.

It is not an unprimeable number, because it can be changed into a prime (47791661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1962 + ... + 9971.

It is an arithmetic number, because the mean of its divisors is an integer number (3490695).

Almost surely, 2^47791665 is an apocalyptic number.

47791665 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

47791665 is a deficient number, since it is larger than the sum of its proper divisors (35985015).

47791665 is a wasteful number, since it uses less digits than its factorization.

47791665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12033 (or 12030 counting only the distinct ones).

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

The square root of 47791665 is about 6913.1515967755. The cubic root of 47791665 is about 362.8975646123.

The spelling of 47791665 in words is "forty-seven million, seven hundred ninety-one thousand, six hundred sixty-five".