78681688 has 8 divisors (see below), whose sum is σ = 147528180. Its totient is φ = 39340840.

The previous prime is 78681683. The next prime is 78681697. The reversal of 78681688 is 88618687.

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 (78681683) 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 as a sum of consecutive naturals, namely, 4917598 + ... + 4917613.

Almost surely, 2^78681688 is an apocalyptic number.

It is an amenable number.

78681688 is a deficient number, since it is larger than the sum of its proper divisors (68846492).

78681688 is a wasteful number, since it uses less digits than its factorization.

78681688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9835217 (or 9835213 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 52.

The square root of 78681688 is about 8870.2698944282. The cubic root of 78681688 is about 428.5069690567.

The spelling of 78681688 in words is "seventy-eight million, six hundred eighty-one thousand, six hundred eighty-eight".