47781878 has 4 divisors (see below), whose sum is σ = 71672820. Its totient is φ = 23890938.

The previous prime is 47781869. The next prime is 47781887. The reversal of 47781878 is 87818774.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (47781869) and next prime (47781887).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11945468 + ... + 11945471.

It is an arithmetic number, because the mean of its divisors is an integer number (17918205).

Almost surely, 2^47781878 is an apocalyptic number.

47781878 is a deficient number, since it is larger than the sum of its proper divisors (23890942).

47781878 is a wasteful number, since it uses less digits than its factorization.

47781878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23890941.

The product of its digits is 702464, while the sum is 50.

The square root of 47781878 is about 6912.4437068232. The cubic root of 47781878 is about 362.8727909693.

The spelling of 47781878 in words is "forty-seven million, seven hundred eighty-one thousand, eight hundred seventy-eight".