78785905 has 16 divisors (see below), whose sum is σ = 109206144. Its totient is φ = 53927680.

The previous prime is 78785899. The next prime is 78785909. The reversal of 78785905 is 50958787.

It is not a de Polignac number, because 78785905 - 2⁵ = 78785873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78785909) 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, 41197 + ... + 43066.

It is an arithmetic number, because the mean of its divisors is an integer number (6825384).

Almost surely, 2^78785905 is an apocalyptic number.

It is an amenable number.

78785905 is a deficient number, since it is larger than the sum of its proper divisors (30420239).

78785905 is a wasteful number, since it uses less digits than its factorization.

78785905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84296.

The product of its (nonzero) digits is 705600, while the sum is 49.

The square root of 78785905 is about 8876.1424616778. The cubic root of 78785905 is about 428.6960770498.

The spelling of 78785905 in words is "seventy-eight million, seven hundred eighty-five thousand, nine hundred five".