47778813 has 12 divisors (see below), whose sum is σ = 69164160. Its totient is φ = 31783176.

The previous prime is 47778793. The next prime is 47778821. The reversal of 47778813 is 31887774.

It is a happy number.

It is not a de Polignac number, because 47778813 - 2¹³ = 47770621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47778833) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1231 + ... + 9852.

It is an arithmetic number, because the mean of its divisors is an integer number (5763680).

Almost surely, 2^47778813 is an apocalyptic number.

It is an amenable number.

47778813 is a deficient number, since it is larger than the sum of its proper divisors (21385347).

47778813 is a wasteful number, since it uses less digits than its factorization.

47778813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11568 (or 11565 counting only the distinct ones).

The product of its digits is 263424, while the sum is 45.

The square root of 47778813 is about 6912.2220016432. Note that the first 3 decimals coincide. The cubic root of 47778813 is about 362.8650318988.

The spelling of 47778813 in words is "forty-seven million, seven hundred seventy-eight thousand, eight hundred thirteen".