78875129 has 4 divisors (see below), whose sum is σ = 81419520. Its totient is φ = 76330740.

The previous prime is 78875117. The next prime is 78875141. The reversal of 78875129 is 92157887.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 92157887 = 257 ⋅358591.

It is an interprime number because it is at equal distance from previous prime (78875117) and next prime (78875141).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78875129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78875179) 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, 1272149 + ... + 1272210.

It is an arithmetic number, because the mean of its divisors is an integer number (20354880).

Almost surely, 2^78875129 is an apocalyptic number.

It is an amenable number.

78875129 is a deficient number, since it is larger than the sum of its proper divisors (2544391).

78875129 is a wasteful number, since it uses less digits than its factorization.

78875129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2544390.

The product of its digits is 282240, while the sum is 47.

The square root of 78875129 is about 8881.1670967278. The cubic root of 78875129 is about 428.8578468852.

The spelling of 78875129 in words is "seventy-eight million, eight hundred seventy-five thousand, one hundred twenty-nine".