78636673 has 4 divisors (see below), whose sum is σ = 78665220. Its totient is φ = 78608128.

The previous prime is 78636671. The next prime is 78636721. The reversal of 78636673 is 37663687.

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

It can be written as a sum of positive squares in 2 ways, for example, as 33907329 + 44729344 = 5823^2 + 6688^2 .

It is a cyclic number.

It is not a de Polignac number, because 78636673 - 2¹ = 78636671 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78636671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9640 + ... + 15817.

It is an arithmetic number, because the mean of its divisors is an integer number (19666305).

Almost surely, 2^78636673 is an apocalyptic number.

It is an amenable number.

78636673 is a deficient number, since it is larger than the sum of its proper divisors (28547).

78636673 is a wasteful number, since it uses less digits than its factorization.

78636673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28546.

The product of its digits is 762048, while the sum is 46.

The square root of 78636673 is about 8867.7321227019. The cubic root of 78636673 is about 428.4252349988.

The spelling of 78636673 in words is "seventy-eight million, six hundred thirty-six thousand, six hundred seventy-three".