78813655 has 4 divisors (see below), whose sum is σ = 94576392. Its totient is φ = 63050920.

The previous prime is 78813629. The next prime is 78813659. The reversal of 78813655 is 55631887.

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

It is not a de Polignac number, because 78813655 - 2¹⁵ = 78780887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78813659) 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, 7881361 + ... + 7881370.

It is an arithmetic number, because the mean of its divisors is an integer number (23644098).

Almost surely, 2^78813655 is an apocalyptic number.

78813655 is a deficient number, since it is larger than the sum of its proper divisors (15762737).

78813655 is a wasteful number, since it uses less digits than its factorization.

78813655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15762736.

The product of its digits is 201600, while the sum is 43.

The square root of 78813655 is about 8877.7055031128. The cubic root of 78813655 is about 428.7464029708.

The spelling of 78813655 in words is "seventy-eight million, eight hundred thirteen thousand, six hundred fifty-five".