77338687 has 4 divisors (see below), whose sum is σ = 77468400. Its totient is φ = 77208976.

The previous prime is 77338663. The next prime is 77338691. The reversal of 77338687 is 78683377.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77338687 - 2¹⁹ = 76814399 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77338687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77338697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63958 + ... + 65155.

It is an arithmetic number, because the mean of its divisors is an integer number (19367100).

Almost surely, 2^77338687 is an apocalyptic number.

77338687 is a deficient number, since it is larger than the sum of its proper divisors (129713).

77338687 is a wasteful number, since it uses less digits than its factorization.

77338687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129712.

The product of its digits is 1185408, while the sum is 49.

The square root of 77338687 is about 8794.2416955642. The cubic root of 77338687 is about 426.0549331469.

The spelling of 77338687 in words is "seventy-seven million, three hundred thirty-eight thousand, six hundred eighty-seven".