78699013 has 4 divisors (see below), whose sum is σ = 78718860. Its totient is φ = 78679168.

The previous prime is 78698993. The next prime is 78699017. The reversal of 78699013 is 31099687.

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 69255684 + 9443329 = 8322^2 + 3073^2 .

It is a cyclic number.

It is not a de Polignac number, because 78699013 - 2¹⁷ = 78567941 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 (78699017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1708 + ... + 12661.

It is an arithmetic number, because the mean of its divisors is an integer number (19679715).

Almost surely, 2^78699013 is an apocalyptic number.

It is an amenable number.

78699013 is a deficient number, since it is larger than the sum of its proper divisors (19847).

78699013 is a wasteful number, since it uses less digits than its factorization.

78699013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19846.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 78699013 is about 8871.2464174996. The cubic root of 78699013 is about 428.5384178754.

It can be divided in two parts, 786 and 99013, that added together give a palindrome (99799).

The spelling of 78699013 in words is "seventy-eight million, six hundred ninety-nine thousand, thirteen".