47878217987 has 2 divisors, whose sum is σ = 47878217988. Its totient is φ = 47878217986.

The previous prime is 47878217951. The next prime is 47878217993. The reversal of 47878217987 is 78971287874.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 47878217987 - 2³² = 43583250691 is a prime.

It is a super-2 number, since 2×47878217987² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (47878210987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23939108993 + 23939108994.

It is an arithmetic number, because the mean of its divisors is an integer number (23939108994).

Almost surely, 2^47878217987 is an apocalyptic number.

47878217987 is a deficient number, since it is larger than the sum of its proper divisors (1).

47878217987 is an equidigital number, since it uses as much as digits as its factorization.

47878217987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 88510464, while the sum is 68.

The spelling of 47878217987 in words is "forty-seven billion, eight hundred seventy-eight million, two hundred seventeen thousand, nine hundred eighty-seven".