78965567 has 4 divisors (see below), whose sum is σ = 79542096. Its totient is φ = 78389040.

The previous prime is 78965543. The next prime is 78965591. The reversal of 78965567 is 76556987.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76556987 = 13 ⋅5888999.

It is an interprime number because it is at equal distance from previous prime (78965543) and next prime (78965591).

It is a cyclic number.

It is not a de Polignac number, because 78965567 - 2¹² = 78961471 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 (78965507) 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 in 3 ways as a sum of consecutive naturals, for example, 288059 + ... + 288332.

It is an arithmetic number, because the mean of its divisors is an integer number (19885524).

Almost surely, 2^78965567 is an apocalyptic number.

78965567 is a deficient number, since it is larger than the sum of its proper divisors (576529).

78965567 is a wasteful number, since it uses less digits than its factorization.

78965567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576528.

The product of its digits is 3175200, while the sum is 53.

The square root of 78965567 is about 8886.2571986186. The cubic root of 78965567 is about 429.0216933443.

The spelling of 78965567 in words is "seventy-eight million, nine hundred sixty-five thousand, five hundred sixty-seven".