71624401 has 2 divisors, whose sum is σ = 71624402. Its totient is φ = 71624400.

The previous prime is 71624389. The next prime is 71624459. The reversal of 71624401 is 10442617.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68558400 + 3066001 = 8280^2 + 1751^2 .

It is an emirp because it is prime and its reverse (10442617) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71624401 is a prime.

It is not a weakly prime, because it can be changed into another prime (71621401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35812200 + 35812201.

It is an arithmetic number, because the mean of its divisors is an integer number (35812201).

Almost surely, 2^71624401 is an apocalyptic number.

It is an amenable number.

71624401 is a deficient number, since it is larger than the sum of its proper divisors (1).

71624401 is an equidigital number, since it uses as much as digits as its factorization.

71624401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 71624401 is about 8463.1200511395. The cubic root of 71624401 is about 415.2920980309.

The spelling of 71624401 in words is "seventy-one million, six hundred twenty-four thousand, four hundred one".