71609644 has 12 divisors (see below), whose sum is σ = 132688584. Its totient is φ = 33698624.

The previous prime is 71609641. The next prime is 71609687. The reversal of 71609644 is 44690617.

It is a super-2 number, since 2×71609644² = 10255882227613472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71609641) 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 3 ways as a sum of consecutive naturals, for example, 526474 + ... + 526609.

It is an arithmetic number, because the mean of its divisors is an integer number (11057382).

Almost surely, 2^71609644 is an apocalyptic number.

It is an amenable number.

71609644 is a deficient number, since it is larger than the sum of its proper divisors (61078940).

71609644 is a wasteful number, since it uses less digits than its factorization.

71609644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1053104 (or 1053102 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 71609644 is about 8462.2481646428. The cubic root of 71609644 is about 415.2635747607.

The spelling of 71609644 in words is "seventy-one million, six hundred nine thousand, six hundred forty-four".