71055405 has 12 divisors (see below), whose sum is σ = 123162780. Its totient is φ = 37896192.

The previous prime is 71055401. The next prime is 71055407. The reversal of 71055405 is 50455017.

It can be written as a sum of positive squares in 2 ways, for example, as 7518564 + 63536841 = 2742^2 + 7971^2 .

It is not a de Polignac number, because 71055405 - 2² = 71055401 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71055401) 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, 789460 + ... + 789549.

It is an arithmetic number, because the mean of its divisors is an integer number (10263565).

Almost surely, 2^71055405 is an apocalyptic number.

It is an amenable number.

71055405 is a deficient number, since it is larger than the sum of its proper divisors (52107375).

71055405 is a wasteful number, since it uses less digits than its factorization.

71055405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1579020 (or 1579017 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The square root of 71055405 is about 8429.4368139277. The cubic root of 71055405 is about 414.1894567999.

The spelling of 71055405 in words is "seventy-one million, fifty-five thousand, four hundred five".