77687047 has 2 divisors, whose sum is σ = 77687048. Its totient is φ = 77687046.

The previous prime is 77687033. The next prime is 77687053. The reversal of 77687047 is 74078677.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77687047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77686988 and 77687006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77687017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38843523 + 38843524.

It is an arithmetic number, because the mean of its divisors is an integer number (38843524).

Almost surely, 2^77687047 is an apocalyptic number.

77687047 is a deficient number, since it is larger than the sum of its proper divisors (1).

77687047 is an equidigital number, since it uses as much as digits as its factorization.

77687047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 460992, while the sum is 46.

The square root of 77687047 is about 8814.0255842606. The cubic root of 77687047 is about 426.6936743022.

The spelling of 77687047 in words is "seventy-seven million, six hundred eighty-seven thousand, forty-seven".