71851540 has 48 divisors (see below), whose sum is σ = 165755520. Its totient is φ = 26040960.

The previous prime is 71851529. The next prime is 71851547. The reversal of 71851540 is 4515817.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71851547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4630 + ... + 12850.

It is an arithmetic number, because the mean of its divisors is an integer number (3453240).

Almost surely, 2^71851540 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 71851540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82877760).

71851540 is an abundant number, since it is smaller than the sum of its proper divisors (93903980).

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

71851540 is a wasteful number, since it uses less digits than its factorization.

71851540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8272 (or 8270 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 31.

The square root of 71851540 is about 8476.5287706702. The cubic root of 71851540 is about 415.7306333724.

The spelling of 71851540 in words is "seventy-one million, eight hundred fifty-one thousand, five hundred forty".