47172866 has 16 divisors (see below), whose sum is σ = 77825664. Its totient is φ = 21308304.

The previous prime is 47172859. The next prime is 47172869. The reversal of 47172866 is 66827174.

47172866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-4 number, since 4×47172866⁴ (a number of 32 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (47172869) 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 7 ways as a sum of consecutive naturals, for example, 18080 + ... + 20523.

It is an arithmetic number, because the mean of its divisors is an integer number (4864104).

Almost surely, 2^47172866 is an apocalyptic number.

47172866 is a deficient number, since it is larger than the sum of its proper divisors (30652798).

47172866 is a wasteful number, since it uses less digits than its factorization.

47172866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38665.

The product of its digits is 112896, while the sum is 41.

The square root of 47172866 is about 6868.2505778400. The cubic root of 47172866 is about 361.3245087630.

It can be divided in two parts, 471 and 72866, that added together give a palindrome (73337).

The spelling of 47172866 in words is "forty-seven million, one hundred seventy-two thousand, eight hundred sixty-six".