47784505 has 4 divisors (see below), whose sum is σ = 57341412. Its totient is φ = 38227600.

The previous prime is 47784469. The next prime is 47784509. The reversal of 47784505 is 50548774.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50548774 = 2 ⋅25274387.

It can be written as a sum of positive squares in 2 ways, for example, as 6990736 + 40793769 = 2644^2 + 6387^2 .

It is not a de Polignac number, because 47784505 - 2¹⁹ = 47260217 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47784509) 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, 4778446 + ... + 4778455.

It is an arithmetic number, because the mean of its divisors is an integer number (14335353).

Almost surely, 2^47784505 is an apocalyptic number.

It is an amenable number.

47784505 is a deficient number, since it is larger than the sum of its proper divisors (9556907).

47784505 is an equidigital number, since it uses as much as digits as its factorization.

47784505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9556906.

The product of its (nonzero) digits is 156800, while the sum is 40.

The square root of 47784505 is about 6912.6337238422. The cubic root of 47784505 is about 362.8794409755.

The spelling of 47784505 in words is "forty-seven million, seven hundred eighty-four thousand, five hundred five".