71224739 has 4 divisors (see below), whose sum is σ = 72568656. Its totient is φ = 69880824.

The previous prime is 71224717. The next prime is 71224753. The reversal of 71224739 is 93742217.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71224739 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71224699 and 71224708.

It is not an unprimeable number, because it can be changed into a prime (71224709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 671879 + ... + 671984.

It is an arithmetic number, because the mean of its divisors is an integer number (18142164).

Almost surely, 2^71224739 is an apocalyptic number.

71224739 is a deficient number, since it is larger than the sum of its proper divisors (1343917).

71224739 is a wasteful number, since it uses less digits than its factorization.

71224739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1343916.

The product of its digits is 21168, while the sum is 35.

The square root of 71224739 is about 8439.4750429159. The cubic root of 71224739 is about 414.5182176991.

The spelling of 71224739 in words is "seventy-one million, two hundred twenty-four thousand, seven hundred thirty-nine".