71471540 has 96 divisors (see below), whose sum is σ = 183079680. Its totient is φ = 22892544.

The previous prime is 71471489. The next prime is 71471551. The reversal of 71471540 is 4517417.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 257882 + ... + 258158.

It is an arithmetic number, because the mean of its divisors is an integer number (1907080).

Almost surely, 2^71471540 is an apocalyptic number.

71471540 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71471540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91539840).

71471540 is an abundant number, since it is smaller than the sum of its proper divisors (111608140).

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

71471540 is a wasteful number, since it uses less digits than its factorization.

71471540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409 (or 407 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 29.

The square root of 71471540 is about 8454.0842200678. The cubic root of 71471540 is about 414.9964484140.

Adding to 71471540 its reverse (4517417), we get a palindrome (75988957).

The spelling of 71471540 in words is "seventy-one million, four hundred seventy-one thousand, five hundred forty".