71143740 has 36 divisors (see below), whose sum is σ = 215803224. Its totient is φ = 18971616.

The previous prime is 71143739. The next prime is 71143747. The reversal of 71143740 is 4734117.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×71143740² = 10122863482375200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71143747) 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 11 ways as a sum of consecutive naturals, for example, 197442 + ... + 197801.

It is an arithmetic number, because the mean of its divisors is an integer number (5994534).

Almost surely, 2^71143740 is an apocalyptic number.

It is an amenable number.

71143740 is an abundant number, since it is smaller than the sum of its proper divisors (144659484).

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

71143740 is a wasteful number, since it uses less digits than its factorization.

71143740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395258 (or 395253 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 71143740 is about 8434.6748603607. The cubic root of 71143740 is about 414.3610237364.

Adding to 71143740 its reverse (4734117), we get a palindrome (75877857).

The spelling of 71143740 in words is "seventy-one million, one hundred forty-three thousand, seven hundred forty".