47686978 has 4 divisors (see below), whose sum is σ = 71530470. Its totient is φ = 23843488.

The previous prime is 47686973. The next prime is 47686987. The reversal of 47686978 is 87968674.

47686978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 31550689 + 16136289 = 5617^2 + 4017^2 .

It is not an unprimeable number, because it can be changed into a prime (47686973) 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 as a sum of consecutive naturals, namely, 11921743 + ... + 11921746.

Almost surely, 2^47686978 is an apocalyptic number.

47686978 is a deficient number, since it is larger than the sum of its proper divisors (23843492).

47686978 is a wasteful number, since it uses less digits than its factorization.

47686978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23843491.

The product of its digits is 4064256, while the sum is 55.

The square root of 47686978 is about 6905.5758630255. The cubic root of 47686978 is about 362.6323968228.

The spelling of 47686978 in words is "forty-seven million, six hundred eighty-six thousand, nine hundred seventy-eight".