47811978 has 32 divisors (see below), whose sum is σ = 107236800. Its totient is φ = 15789168.

The previous prime is 47811977. The next prime is 47811991. The reversal of 47811978 is 87911874.

47811978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (47811971) 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 15 ways as a sum of consecutive naturals, for example, 1825 + ... + 9947.

It is an arithmetic number, because the mean of its divisors is an integer number (3351150).

Almost surely, 2^47811978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 47811978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53618400).

47811978 is an abundant number, since it is smaller than the sum of its proper divisors (59424822).

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

47811978 is a wasteful number, since it uses less digits than its factorization.

47811978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8243 (or 8237 counting only the distinct ones).

The product of its digits is 112896, while the sum is 45.

The square root of 47811978 is about 6914.6205969670. The cubic root of 47811978 is about 362.9489717220.

The spelling of 47811978 in words is "forty-seven million, eight hundred eleven thousand, nine hundred seventy-eight".