77697638 has 8 divisors (see below), whose sum is σ = 117678288. Its totient is φ = 38471544.

The previous prime is 77697637. The next prime is 77697671. The reversal of 77697638 is 83679677.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 77697638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77697637) 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 in 3 ways as a sum of consecutive naturals, for example, 188381 + ... + 188792.

It is an arithmetic number, because the mean of its divisors is an integer number (14709786).

Almost surely, 2^77697638 is an apocalyptic number.

77697638 is a deficient number, since it is larger than the sum of its proper divisors (39980650).

77697638 is a wasteful number, since it uses less digits than its factorization.

77697638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377278.

The product of its digits is 2667168, while the sum is 53.

The square root of 77697638 is about 8814.6263675779. The cubic root of 77697638 is about 426.7130636665.

The spelling of 77697638 in words is "seventy-seven million, six hundred ninety-seven thousand, six hundred thirty-eight".