71457905 has 4 divisors (see below), whose sum is σ = 85749492. Its totient is φ = 57166320.

The previous prime is 71457899. The next prime is 71457913. The reversal of 71457905 is 50975417.

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 32307856 + 39150049 = 5684^2 + 6257^2 .

It is not a de Polignac number, because 71457905 - 2¹⁰ = 71456881 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7145786 + ... + 7145795.

It is an arithmetic number, because the mean of its divisors is an integer number (21437373).

Almost surely, 2^71457905 is an apocalyptic number.

It is an amenable number.

71457905 is a deficient number, since it is larger than the sum of its proper divisors (14291587).

71457905 is a wasteful number, since it uses less digits than its factorization.

71457905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14291586.

The product of its (nonzero) digits is 44100, while the sum is 38.

The square root of 71457905 is about 8453.2777666418. The cubic root of 71457905 is about 414.9700563870.

The spelling of 71457905 in words is "seventy-one million, four hundred fifty-seven thousand, nine hundred five".