77987587 has 2 divisors, whose sum is σ = 77987588. Its totient is φ = 77987586.

The previous prime is 77987573. The next prime is 77987597. The reversal of 77987587 is 78578977.

It is a strong prime.

It is an emirp because it is prime and its reverse (78578977) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77987587 is a prime.

It is not a weakly prime, because it can be changed into another prime (77987597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38993793 + 38993794.

It is an arithmetic number, because the mean of its divisors is an integer number (38993794).

Almost surely, 2^77987587 is an apocalyptic number.

77987587 is a deficient number, since it is larger than the sum of its proper divisors (1).

77987587 is an equidigital number, since it uses as much as digits as its factorization.

77987587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6914880, while the sum is 58.

The square root of 77987587 is about 8831.0580906254. The cubic root of 77987587 is about 427.2432017912.

The spelling of 77987587 in words is "seventy-seven million, nine hundred eighty-seven thousand, five hundred eighty-seven".