71718057 has 6 divisors (see below), whose sum is σ = 103592762. Its totient is φ = 47812032.

The previous prime is 71718037. The next prime is 71718067. The reversal of 71718057 is 75081717.

It can be written as a sum of positive squares in only one way, i.e., 40144896 + 31573161 = 6336^2 + 5619^2 .

It is not a de Polignac number, because 71718057 - 2⁷ = 71717929 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71718037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3984328 + ... + 3984345.

Almost surely, 2^71718057 is an apocalyptic number.

It is an amenable number.

71718057 is a deficient number, since it is larger than the sum of its proper divisors (31874705).

71718057 is a wasteful number, since it uses less digits than its factorization.

71718057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7968679 (or 7968676 counting only the distinct ones).

The product of its (nonzero) digits is 13720, while the sum is 36.

The square root of 71718057 is about 8468.6514274706. The cubic root of 71718057 is about 415.4730310446.

The spelling of 71718057 in words is "seventy-one million, seven hundred eighteen thousand, fifty-seven".