71716621 has 12 divisors (see below), whose sum is σ = 76082652. Its totient is φ = 67590144.

The previous prime is 71716607. The next prime is 71716637. The reversal of 71716621 is 12661717.

It can be written as a sum of positive squares in 2 ways, for example, as 40513225 + 31203396 = 6365^2 + 5586^2 .

It is not a de Polignac number, because 71716621 - 2⁷ = 71716493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71716651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 92391 + ... + 93163.

It is an arithmetic number, because the mean of its divisors is an integer number (6340221).

Almost surely, 2^71716621 is an apocalyptic number.

It is an amenable number.

71716621 is a deficient number, since it is larger than the sum of its proper divisors (4366031).

71716621 is a wasteful number, since it uses less digits than its factorization.

71716621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068 (or 1049 counting only the distinct ones).

The product of its digits is 3528, while the sum is 31.

The square root of 71716621 is about 8468.5666437715. The cubic root of 71716621 is about 415.4702580412.

The spelling of 71716621 in words is "seventy-one million, seven hundred sixteen thousand, six hundred twenty-one".