78128195 has 4 divisors (see below), whose sum is σ = 93753840. Its totient is φ = 62502552.

The previous prime is 78128191. The next prime is 78128203. The reversal of 78128195 is 59182187.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78128195 - 2² = 78128191 is a prime.

It is a super-2 number, since 2×78128195² = 12208029707916050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78128191) 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, 7812815 + ... + 7812824.

It is an arithmetic number, because the mean of its divisors is an integer number (23438460).

Almost surely, 2^78128195 is an apocalyptic number.

78128195 is a deficient number, since it is larger than the sum of its proper divisors (15625645).

78128195 is a wasteful number, since it uses less digits than its factorization.

78128195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15625644.

The product of its digits is 40320, while the sum is 41.

The square root of 78128195 is about 8839.0154994773. The cubic root of 78128195 is about 427.4998141878.

The spelling of 78128195 in words is "seventy-eight million, one hundred twenty-eight thousand, one hundred ninety-five".