78646785 has 32 divisors (see below), whose sum is σ = 147164160. Its totient is φ = 35114688.

The previous prime is 78646759. The next prime is 78646787. The reversal of 78646785 is 58764687.

It is not a de Polignac number, because 78646785 - 2¹⁸ = 78384641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78646787) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4195 + ... + 13224.

It is an arithmetic number, because the mean of its divisors is an integer number (4598880).

Almost surely, 2^78646785 is an apocalyptic number.

It is an amenable number.

78646785 is a deficient number, since it is larger than the sum of its proper divisors (68517375).

78646785 is a wasteful number, since it uses less digits than its factorization.

78646785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17477.

The product of its digits is 2257920, while the sum is 51.

The square root of 78646785 is about 8868.3022614252. The cubic root of 78646785 is about 428.4435981455.

The spelling of 78646785 in words is "seventy-eight million, six hundred forty-six thousand, seven hundred eighty-five".