71609697 has 16 divisors (see below), whose sum is σ = 106634880. Its totient is φ = 47493936.

The previous prime is 71609693. The next prime is 71609711. The reversal of 71609697 is 79690617.

It is not a de Polignac number, because 71609697 - 2² = 71609693 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71609693) 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 15 ways as a sum of consecutive naturals, for example, 1413 + ... + 12050.

It is an arithmetic number, because the mean of its divisors is an integer number (6664680).

Almost surely, 2^71609697 is an apocalyptic number.

It is an amenable number.

71609697 is a deficient number, since it is larger than the sum of its proper divisors (35025183).

71609697 is a wasteful number, since it uses less digits than its factorization.

71609697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13669 (or 13663 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 45.

The square root of 71609697 is about 8462.2512961977. The cubic root of 71609697 is about 415.2636772095.

It can be divided in two parts, 7160969 and 7, that added together give a square (7160976 = 2676²).

The spelling of 71609697 in words is "seventy-one million, six hundred nine thousand, six hundred ninety-seven".