71712705 has 16 divisors (see below), whose sum is σ = 115251264. Its totient is φ = 38076480.

The previous prime is 71712701. The next prime is 71712757. The reversal of 71712705 is 50721717.

It is not a de Polignac number, because 71712705 - 2² = 71712701 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71712701) 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 15 ways as a sum of consecutive naturals, for example, 7126 + ... + 13935.

It is an arithmetic number, because the mean of its divisors is an integer number (7203204).

Almost surely, 2^71712705 is an apocalyptic number.

It is an amenable number.

71712705 is a deficient number, since it is larger than the sum of its proper divisors (43538559).

71712705 is a wasteful number, since it uses less digits than its factorization.

71712705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21296.

The product of its (nonzero) digits is 3430, while the sum is 30.

The square root of 71712705 is about 8468.3354326574. The cubic root of 71712705 is about 415.4626958187.

The spelling of 71712705 in words is "seventy-one million, seven hundred twelve thousand, seven hundred five".