71621613 has 24 divisors (see below), whose sum is σ = 119665728. Its totient is φ = 40430592.

The previous prime is 71621591. The next prime is 71621623. The reversal of 71621613 is 31612617.

It is not a de Polignac number, because 71621613 - 2⁵ = 71621581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71621623) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1620 + ... + 12077.

It is an arithmetic number, because the mean of its divisors is an integer number (4986072).

Almost surely, 2^71621613 is an apocalyptic number.

It is an amenable number.

71621613 is a deficient number, since it is larger than the sum of its proper divisors (48044115).

71621613 is a wasteful number, since it uses less digits than its factorization.

71621613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13793 (or 13790 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 71621613 is about 8462.9553348697. The cubic root of 71621613 is about 415.2867095070.

The spelling of 71621613 in words is "seventy-one million, six hundred twenty-one thousand, six hundred thirteen".