71013644 has 24 divisors (see below), whose sum is σ = 134146320. Its totient is φ = 32698944.

The previous prime is 71013643. The next prime is 71013647. The reversal of 71013644 is 44631017.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (71013643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25127 + ... + 27809.

It is an arithmetic number, because the mean of its divisors is an integer number (5589430).

Almost surely, 2^71013644 is an apocalyptic number.

It is an amenable number.

71013644 is a deficient number, since it is larger than the sum of its proper divisors (63132676).

71013644 is a wasteful number, since it uses less digits than its factorization.

71013644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3209 (or 3207 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 71013644 is about 8426.9593567312. The cubic root of 71013644 is about 414.1082978055.

The spelling of 71013644 in words is "seventy-one million, thirteen thousand, six hundred forty-four".