71740521 has 24 divisors (see below), whose sum is σ = 107571464. Its totient is φ = 46033920.

The previous prime is 71740511. The next prime is 71740549. The reversal of 71740521 is 12504717.

71740521 is a `hidden beast` number, since 71 + 74 + 0 + 521 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 28772496 + 42968025 = 5364^2 + 6555^2 .

It is not a de Polignac number, because 71740521 - 2¹¹ = 71738473 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71740511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31191 + ... + 33411.

Almost surely, 2^71740521 is an apocalyptic number.

It is an amenable number.

71740521 is a deficient number, since it is larger than the sum of its proper divisors (35830943).

71740521 is a wasteful number, since it uses less digits than its factorization.

71740521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2361 (or 2358 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 27.

The square root of 71740521 is about 8469.9776268890. The cubic root of 71740521 is about 415.5164055785.

The spelling of 71740521 in words is "seventy-one million, seven hundred forty thousand, five hundred twenty-one".