71811387 has 16 divisors (see below), whose sum is σ = 107333280. Its totient is φ = 47448576.

The previous prime is 71811379. The next prime is 71811401. The reversal of 71811387 is 78311817.

It is not a de Polignac number, because 71811387 - 2³ = 71811379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71811307) 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 15 ways as a sum of consecutive naturals, for example, 8718 + ... + 14819.

It is an arithmetic number, because the mean of its divisors is an integer number (6708330).

Almost surely, 2^71811387 is an apocalyptic number.

71811387 is a deficient number, since it is larger than the sum of its proper divisors (35521893).

71811387 is a wasteful number, since it uses less digits than its factorization.

71811387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23659 (or 23653 counting only the distinct ones).

The product of its digits is 9408, while the sum is 36.

The square root of 71811387 is about 8474.1599583676. The cubic root of 71811387 is about 415.6531776325.

The spelling of 71811387 in words is "seventy-one million, eight hundred eleven thousand, three hundred eighty-seven".