71144747 has 16 divisors (see below), whose sum is σ = 75701472. Its totient is φ = 66769920.

The previous prime is 71144729. The next prime is 71144761. The reversal of 71144747 is 74744117.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71144747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71140747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154097 + ... + 154557.

It is an arithmetic number, because the mean of its divisors is an integer number (4731342).

Almost surely, 2^71144747 is an apocalyptic number.

71144747 is a deficient number, since it is larger than the sum of its proper divisors (4556725).

71144747 is a wasteful number, since it uses less digits than its factorization.

71144747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638.

The product of its digits is 21952, while the sum is 35.

The square root of 71144747 is about 8434.7345542109. The cubic root of 71144747 is about 414.3629787437.

The spelling of 71144747 in words is "seventy-one million, one hundred forty-four thousand, seven hundred forty-seven".