78985634 has 32 divisors (see below), whose sum is σ = 152167680. Its totient is φ = 29886912.

The previous prime is 78985633. The next prime is 78985649. The reversal of 78985634 is 43658987.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (78985633) 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 15 ways as a sum of consecutive naturals, for example, 5249 + ... + 13620.

It is an arithmetic number, because the mean of its divisors is an integer number (4755240).

Almost surely, 2^78985634 is an apocalyptic number.

78985634 is a deficient number, since it is larger than the sum of its proper divisors (73182046).

78985634 is a wasteful number, since it uses less digits than its factorization.

78985634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18914.

The product of its digits is 1451520, while the sum is 50.

The square root of 78985634 is about 8887.3862299328. The cubic root of 78985634 is about 429.0580317531.

The spelling of 78985634 in words is "seventy-eight million, nine hundred eighty-five thousand, six hundred thirty-four".