47678181 has 8 divisors (see below), whose sum is σ = 63666720. Its totient is φ = 31737552.

The previous prime is 47678179. The next prime is 47678209. The reversal of 47678181 is 18187674.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 47678181 - 2¹ = 47678179 is a prime.

It is a super-2 number, since 2×47678181² = 4546417886937522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47678171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9586 + ... + 13683.

It is an arithmetic number, because the mean of its divisors is an integer number (7958340).

Almost surely, 2^47678181 is an apocalyptic number.

It is an amenable number.

47678181 is a deficient number, since it is larger than the sum of its proper divisors (15988539).

47678181 is a wasteful number, since it uses less digits than its factorization.

47678181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23955.

The product of its digits is 75264, while the sum is 42.

The square root of 47678181 is about 6904.9388845956. The cubic root of 47678181 is about 362.6100967211.

The spelling of 47678181 in words is "forty-seven million, six hundred seventy-eight thousand, one hundred eighty-one".