71161740 has 240 divisors, whose sum is σ = 250440960. Its totient is φ = 16796160.

The previous prime is 71161723. The next prime is 71161759. The reversal of 71161740 is 4716117.

71161740 is a `hidden beast` number, since 7 + 1 + 1 + 617 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 652806 + ... + 652914.

It is an arithmetic number, because the mean of its divisors is an integer number (1043504).

Almost surely, 2^71161740 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 71161740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125220480).

71161740 is an abundant number, since it is smaller than the sum of its proper divisors (179279220).

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

71161740 is a wasteful number, since it uses less digits than its factorization.

71161740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174 (or 163 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 27.

The square root of 71161740 is about 8435.7418168173. The cubic root of 71161740 is about 414.3959664664.

Adding to 71161740 its reverse (4716117), we get a palindrome (75877857).

The spelling of 71161740 in words is "seventy-one million, one hundred sixty-one thousand, seven hundred forty".