71706401 has 4 divisors (see below), whose sum is σ = 77222292. Its totient is φ = 66190512.

The previous prime is 71706389. The next prime is 71706457. The reversal of 71706401 is 10460717.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9296401 + 62410000 = 3049^2 + 7900^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71706401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71706491) 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, 2757926 + ... + 2757951.

It is an arithmetic number, because the mean of its divisors is an integer number (19305573).

Almost surely, 2^71706401 is an apocalyptic number.

It is an amenable number.

71706401 is a deficient number, since it is larger than the sum of its proper divisors (5515891).

71706401 is a wasteful number, since it uses less digits than its factorization.

71706401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5515890.

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 71706401 is about 8467.9632143745. The cubic root of 71706401 is about 415.4505215297.

The spelling of 71706401 in words is "seventy-one million, seven hundred six thousand, four hundred one".