47217778 has 4 divisors (see below), whose sum is σ = 70826670. Its totient is φ = 23608888.

The previous prime is 47217763. The next prime is 47217799. The reversal of 47217778 is 87771274.

47217778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 45387169 + 1830609 = 6737^2 + 1353^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 11804443 + ... + 11804446.

Almost surely, 2^47217778 is an apocalyptic number.

47217778 is a deficient number, since it is larger than the sum of its proper divisors (23608892).

47217778 is a wasteful number, since it uses less digits than its factorization.

47217778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23608891.

The product of its digits is 153664, while the sum is 43.

The square root of 47217778 is about 6871.5193370899. The cubic root of 47217778 is about 361.4391414633.

The spelling of 47217778 in words is "forty-seven million, two hundred seventeen thousand, seven hundred seventy-eight".