47978087 has 2 divisors, whose sum is σ = 47978088. Its totient is φ = 47978086.

The previous prime is 47978083. The next prime is 47978089. The reversal of 47978087 is 78087974.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 47978087 - 2² = 47978083 is a prime.

Together with 47978089, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47978083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23989043 + 23989044.

It is an arithmetic number, because the mean of its divisors is an integer number (23989044).

Almost surely, 2^47978087 is an apocalyptic number.

47978087 is a deficient number, since it is larger than the sum of its proper divisors (1).

47978087 is an equidigital number, since it uses as much as digits as its factorization.

47978087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 790272, while the sum is 50.

The square root of 47978087 is about 6926.6216151887. The cubic root of 47978087 is about 363.3688065881.

The spelling of 47978087 in words is "forty-seven million, nine hundred seventy-eight thousand, eighty-seven".