77987667 has 8 divisors (see below), whose sum is σ = 104070096. Its totient is φ = 51948512.

The previous prime is 77987659. The next prime is 77987669. The reversal of 77987667 is 76678977.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77987667 - 2³ = 77987659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77987669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6348 + ... + 14009.

It is an arithmetic number, because the mean of its divisors is an integer number (13008762).

Almost surely, 2^77987667 is an apocalyptic number.

77987667 is a deficient number, since it is larger than the sum of its proper divisors (26082429).

77987667 is a wasteful number, since it uses less digits than its factorization.

77987667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21637.

The product of its digits is 6223392, while the sum is 57.

The square root of 77987667 is about 8831.0626200928. The cubic root of 77987667 is about 427.2433478805.

The spelling of 77987667 in words is "seventy-seven million, nine hundred eighty-seven thousand, six hundred sixty-seven".