78507613 has 2 divisors, whose sum is σ = 78507614. Its totient is φ = 78507612.

The previous prime is 78507587. The next prime is 78507619. The reversal of 78507613 is 31670587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72641529 + 5866084 = 8523^2 + 2422^2 .

It is a cyclic number.

It is not a de Polignac number, because 78507613 - 2¹⁷ = 78376541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78507619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39253806 + 39253807.

It is an arithmetic number, because the mean of its divisors is an integer number (39253807).

Almost surely, 2^78507613 is an apocalyptic number.

It is an amenable number.

78507613 is a deficient number, since it is larger than the sum of its proper divisors (1).

78507613 is an equidigital number, since it uses as much as digits as its factorization.

78507613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 78507613 is about 8860.4521893637. The cubic root of 78507613 is about 428.1907267836.

The spelling of 78507613 in words is "seventy-eight million, five hundred seven thousand, six hundred thirteen".