78478735 has 4 divisors (see below), whose sum is σ = 94174488. Its totient is φ = 62782984.

The previous prime is 78478733. The next prime is 78478753. The reversal of 78478735 is 53787487.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78478735 - 2¹ = 78478733 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78478733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7847869 + ... + 7847878.

It is an arithmetic number, because the mean of its divisors is an integer number (23543622).

Almost surely, 2^78478735 is an apocalyptic number.

78478735 is a deficient number, since it is larger than the sum of its proper divisors (15695753).

78478735 is a wasteful number, since it uses less digits than its factorization.

78478735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15695752.

The product of its digits is 1317120, while the sum is 49.

The square root of 78478735 is about 8858.8224386766. The cubic root of 78478735 is about 428.1382188896.

The spelling of 78478735 in words is "seventy-eight million, four hundred seventy-eight thousand, seven hundred thirty-five".