71543740 has 24 divisors (see below), whose sum is σ = 158150160. Its totient is φ = 27111168.

The previous prime is 71543737. The next prime is 71543741. The reversal of 71543740 is 4734517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71543741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93757 + ... + 94516.

It is an arithmetic number, because the mean of its divisors is an integer number (6589590).

Almost surely, 2^71543740 is an apocalyptic number.

It is an amenable number.

71543740 is an abundant number, since it is smaller than the sum of its proper divisors (86606420).

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

71543740 is a wasteful number, since it uses less digits than its factorization.

71543740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188301 (or 188299 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 31.

The square root of 71543740 is about 8458.3532676284. The cubic root of 71543740 is about 415.1361434584.

The spelling of 71543740 in words is "seventy-one million, five hundred forty-three thousand, seven hundred forty".