78078171 has 4 divisors (see below), whose sum is σ = 104104232. Its totient is φ = 52052112.

The previous prime is 78078167. The next prime is 78078173. The reversal of 78078171 is 17187087.

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

It is not a de Polignac number, because 78078171 - 2² = 78078167 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78078173) 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, 13013026 + ... + 13013031.

It is an arithmetic number, because the mean of its divisors is an integer number (26026058).

Almost surely, 2^78078171 is an apocalyptic number.

78078171 is a deficient number, since it is larger than the sum of its proper divisors (26026061).

78078171 is a wasteful number, since it uses less digits than its factorization.

78078171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26026060.

The product of its (nonzero) digits is 21952, while the sum is 39.

The square root of 78078171 is about 8836.1853194690. The cubic root of 78078171 is about 427.4085547028.

The spelling of 78078171 in words is "seventy-eight million, seventy-eight thousand, one hundred seventy-one".