71624681 has 2 divisors, whose sum is σ = 71624682. Its totient is φ = 71624680.

The previous prime is 71624659. The next prime is 71624717. The reversal of 71624681 is 18642617.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41473600 + 30151081 = 6440^2 + 5491^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71624681 is a prime.

It is a super-2 number, since 2×71624681² = 10260189856703522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71624611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35812340 + 35812341.

It is an arithmetic number, because the mean of its divisors is an integer number (35812341).

Almost surely, 2^71624681 is an apocalyptic number.

It is an amenable number.

71624681 is a deficient number, since it is larger than the sum of its proper divisors (1).

71624681 is an equidigital number, since it uses as much as digits as its factorization.

71624681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 35.

The square root of 71624681 is about 8463.1365934859. The cubic root of 71624681 is about 415.2926391949.

The spelling of 71624681 in words is "seventy-one million, six hundred twenty-four thousand, six hundred eighty-one".