71187864 has 32 divisors (see below), whose sum is σ = 194149440. Its totient is φ = 21572000.

The previous prime is 71187859. The next prime is 71187887. The reversal of 71187864 is 46878117.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134562 + ... + 135089.

It is an arithmetic number, because the mean of its divisors is an integer number (6067170).

Almost surely, 2^71187864 is an apocalyptic number.

It is an amenable number.

71187864 is an abundant number, since it is smaller than the sum of its proper divisors (122961576).

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

71187864 is a wasteful number, since it uses less digits than its factorization.

71187864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269671 (or 269667 counting only the distinct ones).

The product of its digits is 75264, while the sum is 42.

The square root of 71187864 is about 8437.2900862777. The cubic root of 71187864 is about 414.4466695351.

The spelling of 71187864 in words is "seventy-one million, one hundred eighty-seven thousand, eight hundred sixty-four".