78666712 has 8 divisors (see below), whose sum is σ = 147500100. Its totient is φ = 39333352.

The previous prime is 78666703. The next prime is 78666713. The reversal of 78666712 is 21766687.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78666713) 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 as a sum of consecutive naturals, namely, 4916662 + ... + 4916677.

Almost surely, 2^78666712 is an apocalyptic number.

It is an amenable number.

78666712 is a deficient number, since it is larger than the sum of its proper divisors (68833388).

78666712 is a wasteful number, since it uses less digits than its factorization.

78666712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9833345 (or 9833341 counting only the distinct ones).

The product of its digits is 169344, while the sum is 43.

The square root of 78666712 is about 8869.4256860295. The cubic root of 78666712 is about 428.4797804875.

The spelling of 78666712 in words is "seventy-eight million, six hundred sixty-six thousand, seven hundred twelve".