78171412 has 12 divisors (see below), whose sum is σ = 149236416. Its totient is φ = 35532440.

The previous prime is 78171409. The next prime is 78171517. The reversal of 78171412 is 21417187.

It is a super-2 number, since 2×78171412² = 12221539308147488, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 888268 + ... + 888355.

It is an arithmetic number, because the mean of its divisors is an integer number (12436368).

Almost surely, 2^78171412 is an apocalyptic number.

It is an amenable number.

78171412 is a deficient number, since it is larger than the sum of its proper divisors (71065004).

78171412 is a wasteful number, since it uses less digits than its factorization.

78171412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1776638 (or 1776636 counting only the distinct ones).

The product of its digits is 3136, while the sum is 31.

The square root of 78171412 is about 8841.4598342129. The cubic root of 78171412 is about 427.5786242083.

Adding to 78171412 its reverse (21417187), we get a palindrome (99588599).

It can be divided in two parts, 7817 and 1412, that added together give a palindrome (9229).

The spelling of 78171412 in words is "seventy-eight million, one hundred seventy-one thousand, four hundred twelve".