47221668 has 144 divisors (see below), whose sum is σ = 138692736. Its totient is φ = 13432320.

The previous prime is 47221661. The next prime is 47221673. The reversal of 47221668 is 86612274.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (47221661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 441271 + ... + 441377.

It is an arithmetic number, because the mean of its divisors is an integer number (963144).

Almost surely, 2^47221668 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 47221668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69346368).

47221668 is an abundant number, since it is smaller than the sum of its proper divisors (91471068).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

47221668 is a wasteful number, since it uses less digits than its factorization.

47221668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194 (or 189 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 47221668 is about 6871.8023836545. The cubic root of 47221668 is about 361.4490668185.

The spelling of 47221668 in words is "forty-seven million, two hundred twenty-one thousand, six hundred sixty-eight".