78729386 has 8 divisors (see below), whose sum is σ = 118177860. Its totient is φ = 39336768.

The previous prime is 78729373. The next prime is 78729419. The reversal of 78729386 is 68392787.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 78659161 + 70225 = 8869^2 + 265^2 .

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

It is a Curzon number.

It is an unprimeable number.

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, 10241 + ... + 16196.

Almost surely, 2^78729386 is an apocalyptic number.

78729386 is a deficient number, since it is larger than the sum of its proper divisors (39448474).

78729386 is a wasteful number, since it uses less digits than its factorization.

78729386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27928.

The product of its digits is 1016064, while the sum is 50.

The square root of 78729386 is about 8872.9581313111. The cubic root of 78729386 is about 428.5935406475.

The spelling of 78729386 in words is "seventy-eight million, seven hundred twenty-nine thousand, three hundred eighty-six".