47781845 has 16 divisors (see below), whose sum is σ = 59056128. Its totient is φ = 37094400.

The previous prime is 47781829. The next prime is 47781847. The reversal of 47781845 is 54818774.

47781845 = 263² + 264² + ... + 544².

It is not a de Polignac number, because 47781845 - 2⁴ = 47781829 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 47781796 and 47781805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47781847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29045 + ... + 30645.

It is an arithmetic number, because the mean of its divisors is an integer number (3691008).

Almost surely, 2^47781845 is an apocalyptic number.

It is an amenable number.

47781845 is a deficient number, since it is larger than the sum of its proper divisors (11274283).

47781845 is a wasteful number, since it uses less digits than its factorization.

47781845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1780.

The product of its digits is 250880, while the sum is 44.

The square root of 47781845 is about 6912.4413198233. The cubic root of 47781845 is about 362.8727074313.

The spelling of 47781845 in words is "forty-seven million, seven hundred eighty-one thousand, eight hundred forty-five".