71720705 has 16 divisors (see below), whose sum is σ = 104146560. Its totient is φ = 46286592.

The previous prime is 71720681. The next prime is 71720717. The reversal of 71720705 is 50702717.

It is a cyclic number.

It is not a de Polignac number, because 71720705 - 2⁶ = 71720641 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 59675 + ... + 60864.

It is an arithmetic number, because the mean of its divisors is an integer number (6509160).

Almost surely, 2^71720705 is an apocalyptic number.

It is an amenable number.

71720705 is a deficient number, since it is larger than the sum of its proper divisors (32425855).

71720705 is a wasteful number, since it uses less digits than its factorization.

71720705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120568.

The product of its (nonzero) digits is 3430, while the sum is 29.

The square root of 71720705 is about 8468.8077673307. The cubic root of 71720705 is about 415.4781443968.

The spelling of 71720705 in words is "seventy-one million, seven hundred twenty thousand, seven hundred five".