71187678 has 12 divisors (see below), whose sum is σ = 154240008. Its totient is φ = 23729220.

The previous prime is 71187659. The next prime is 71187679. The reversal of 71187678 is 87678117.

It is a happy number.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71187679) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1977418 + ... + 1977453.

It is an arithmetic number, because the mean of its divisors is an integer number (12853334).

Almost surely, 2^71187678 is an apocalyptic number.

71187678 is an abundant number, since it is smaller than the sum of its proper divisors (83052330).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71187678 is a wasteful number, since it uses less digits than its factorization.

71187678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3954879 (or 3954876 counting only the distinct ones).

The product of its digits is 131712, while the sum is 45.

The square root of 71187678 is about 8437.2790637741. The cubic root of 71187678 is about 414.4463085787.

The spelling of 71187678 in words is "seventy-one million, one hundred eighty-seven thousand, six hundred seventy-eight".