47778287 has 2 divisors, whose sum is σ = 47778288. Its totient is φ = 47778286.

The previous prime is 47778277. The next prime is 47778299. The reversal of 47778287 is 78287774.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47778287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47778257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23889143 + 23889144.

It is an arithmetic number, because the mean of its divisors is an integer number (23889144).

Almost surely, 2^47778287 is an apocalyptic number.

47778287 is a deficient number, since it is larger than the sum of its proper divisors (1).

47778287 is an equidigital number, since it uses as much as digits as its factorization.

47778287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1229312, while the sum is 50.

The square root of 47778287 is about 6912.1839529920. The cubic root of 47778287 is about 362.8637002925.

The spelling of 47778287 in words is "forty-seven million, seven hundred seventy-eight thousand, two hundred eighty-seven".