47778471 has 32 divisors (see below), whose sum is σ = 78704640. Its totient is φ = 28447200.

The previous prime is 47778469. The next prime is 47778473. The reversal of 47778471 is 17487774.

It is a happy number.

47778471 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (47778469) and next prime (47778473).

It is not a de Polignac number, because 47778471 - 2¹ = 47778469 is a prime.

It is a super-3 number, since 3×47778471³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47778473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8686 + ... + 13076.

It is an arithmetic number, because the mean of its divisors is an integer number (2459520).

Almost surely, 2^47778471 is an apocalyptic number.

47778471 is a deficient number, since it is larger than the sum of its proper divisors (30926169).

47778471 is a wasteful number, since it uses less digits than its factorization.

47778471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4444 (or 4438 counting only the distinct ones).

The product of its digits is 307328, while the sum is 45.

The square root of 47778471 is about 6912.1972628101. The cubic root of 47778471 is about 362.8641661026.

The spelling of 47778471 in words is "forty-seven million, seven hundred seventy-eight thousand, four hundred seventy-one".