78768661 has 8 divisors (see below), whose sum is σ = 83061920. Its totient is φ = 74490192.

The previous prime is 78768643. The next prime is 78768673. The reversal of 78768661 is 16686787.

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 78768661 - 2⁹ = 78768149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78768601) 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 7 ways as a sum of consecutive naturals, for example, 8266 + ... + 15028.

It is an arithmetic number, because the mean of its divisors is an integer number (10382740).

Almost surely, 2^78768661 is an apocalyptic number.

It is an amenable number.

78768661 is a deficient number, since it is larger than the sum of its proper divisors (4293259).

78768661 is a wasteful number, since it uses less digits than its factorization.

78768661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7395.

The product of its digits is 677376, while the sum is 49.

The square root of 78768661 is about 8875.1710406054. The cubic root of 78768661 is about 428.6647982970.

The spelling of 78768661 in words is "seventy-eight million, seven hundred sixty-eight thousand, six hundred sixty-one".