78105129 has 4 divisors (see below), whose sum is σ = 104140176. Its totient is φ = 52070084.

The previous prime is 78105119. The next prime is 78105163. The reversal of 78105129 is 92150187.

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: 92150187 = 3 ⋅30716729.

It is a cyclic number.

It is not a de Polignac number, because 78105129 - 2⁹ = 78104617 is a prime.

It is a super-2 number, since 2×78105129² = 12200822352213282, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78105129.

It is not an unprimeable number, because it can be changed into a prime (78105119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13017519 + ... + 13017524.

It is an arithmetic number, because the mean of its divisors is an integer number (26035044).

Almost surely, 2^78105129 is an apocalyptic number.

It is an amenable number.

78105129 is a deficient number, since it is larger than the sum of its proper divisors (26035047).

78105129 is a wasteful number, since it uses less digits than its factorization.

78105129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26035046.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 78105129 is about 8837.7106198381. The cubic root of 78105129 is about 427.4577394017.

The spelling of 78105129 in words is "seventy-eight million, one hundred five thousand, one hundred twenty-nine".