71256865 has 8 divisors (see below), whose sum is σ = 85818600. Its totient is φ = 56798592.

The previous prime is 71256863. The next prime is 71256869. The reversal of 71256865 is 56865217.

It can be written as a sum of positive squares in 4 ways, for example, as 141376 + 71115489 = 376^2 + 8433^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71256865 - 2¹ = 71256863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71256863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24340 + ... + 27109.

It is an arithmetic number, because the mean of its divisors is an integer number (10727325).

Almost surely, 2^71256865 is an apocalyptic number.

It is an amenable number.

71256865 is a deficient number, since it is larger than the sum of its proper divisors (14561735).

71256865 is a wasteful number, since it uses less digits than its factorization.

71256865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51731.

The product of its digits is 100800, while the sum is 40.

The square root of 71256865 is about 8441.3781457769. The cubic root of 71256865 is about 414.5805313032.

The spelling of 71256865 in words is "seventy-one million, two hundred fifty-six thousand, eight hundred sixty-five".