71964644 has 6 divisors (see below), whose sum is σ = 125938134. Its totient is φ = 35982320.

The previous prime is 71964583. The next prime is 71964649. The reversal of 71964644 is 44646917.

It can be written as a sum of positive squares in only one way, i.e., 70728100 + 1236544 = 8410^2 + 1112^2 .

It is not an unprimeable number, because it can be changed into a prime (71964649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8995577 + ... + 8995584.

It is an arithmetic number, because the mean of its divisors is an integer number (20989689).

Almost surely, 2^71964644 is an apocalyptic number.

It is an amenable number.

71964644 is a deficient number, since it is larger than the sum of its proper divisors (53973490).

71964644 is a wasteful number, since it uses less digits than its factorization.

71964644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17991165 (or 17991163 counting only the distinct ones).

The product of its digits is 145152, while the sum is 41.

The square root of 71964644 is about 8483.1977461332. The cubic root of 71964644 is about 415.9486576799.

The spelling of 71964644 in words is "seventy-one million, nine hundred sixty-four thousand, six hundred forty-four".