47218664 has 8 divisors (see below), whose sum is σ = 88535010. Its totient is φ = 23609328.

The previous prime is 47218657. The next prime is 47218669. The reversal of 47218664 is 46681274.

It can be written as a sum of positive squares in only one way, i.e., 42120100 + 5098564 = 6490^2 + 2258^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (47218669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2951159 + ... + 2951174.

Almost surely, 2^47218664 is an apocalyptic number.

It is an amenable number.

47218664 is a deficient number, since it is larger than the sum of its proper divisors (41316346).

47218664 is a wasteful number, since it uses less digits than its factorization.

47218664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5902339 (or 5902335 counting only the distinct ones).

The product of its digits is 64512, while the sum is 38.

The square root of 47218664 is about 6871.5838057903. The cubic root of 47218664 is about 361.4414021449.

The spelling of 47218664 in words is "forty-seven million, two hundred eighteen thousand, six hundred sixty-four".