71143864 has 32 divisors (see below), whose sum is σ = 146876400. Its totient is φ = 32037120.

The previous prime is 71143823. The next prime is 71143889. The reversal of 71143864 is 46834117.

It is a happy number.

It is a super-2 number, since 2×71143864² = 10122898769700992, 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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5884 + ... + 13300.

Almost surely, 2^71143864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71143864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73438200).

71143864 is an abundant number, since it is smaller than the sum of its proper divisors (75732536).

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

71143864 is a wasteful number, since it uses less digits than its factorization.

71143864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7543 (or 7539 counting only the distinct ones).

The product of its digits is 16128, while the sum is 34.

The square root of 71143864 is about 8434.6822109668. The cubic root of 71143864 is about 414.3612644732.

The spelling of 71143864 in words is "seventy-one million, one hundred forty-three thousand, eight hundred sixty-four".