71740781 has 4 divisors (see below), whose sum is σ = 81989472. Its totient is φ = 61492092.

The previous prime is 71740759. The next prime is 71740787. The reversal of 71740781 is 18704717.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71740781 - 2¹⁰ = 71739757 is a prime.

It is a super-2 number, since 2×71740781² = 10293479316979922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71740787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5124335 + ... + 5124348.

It is an arithmetic number, because the mean of its divisors is an integer number (20497368).

Almost surely, 2^71740781 is an apocalyptic number.

It is an amenable number.

71740781 is a deficient number, since it is larger than the sum of its proper divisors (10248691).

71740781 is a wasteful number, since it uses less digits than its factorization.

71740781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10248690.

The product of its (nonzero) digits is 10976, while the sum is 35.

The square root of 71740781 is about 8469.9929752037. The cubic root of 71740781 is about 415.5169075455.

The spelling of 71740781 in words is "seventy-one million, seven hundred forty thousand, seven hundred eighty-one".