78936705 has 24 divisors (see below), whose sum is σ = 137353320. Its totient is φ = 41936640.

The previous prime is 78936703. The next prime is 78936707. The reversal of 78936705 is 50763987.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (78936703) and next prime (78936707).

It can be written as a sum of positive squares in 4 ways, for example, as 7568001 + 71368704 = 2751^2 + 8448^2 .

It is not a de Polignac number, because 78936705 - 2¹ = 78936703 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (78936703) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8845 + ... + 15365.

It is an arithmetic number, because the mean of its divisors is an integer number (5723055).

Almost surely, 2^78936705 is an apocalyptic number.

It is an amenable number.

78936705 is a deficient number, since it is larger than the sum of its proper divisors (58416615).

78936705 is a wasteful number, since it uses less digits than its factorization.

78936705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6801 (or 6798 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The square root of 78936705 is about 8884.6330819005. The cubic root of 78936705 is about 428.9694176774.

The spelling of 78936705 in words is "seventy-eight million, nine hundred thirty-six thousand, seven hundred five".