71477845 has 8 divisors (see below), whose sum is σ = 86658264. Its totient is φ = 56592384.

The previous prime is 71477839. The next prime is 71477881. The reversal of 71477845 is 54877417.

It can be written as a sum of positive squares in 4 ways, for example, as 7365796 + 64112049 = 2714^2 + 8007^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71477845 - 2⁷ = 71477717 is a prime.

It is a Duffinian number.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 73204 + ... + 74173.

It is an arithmetic number, because the mean of its divisors is an integer number (10832283).

Almost surely, 2^71477845 is an apocalyptic number.

It is an amenable number.

71477845 is a deficient number, since it is larger than the sum of its proper divisors (15180419).

71477845 is a wasteful number, since it uses less digits than its factorization.

71477845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147479.

The product of its digits is 219520, while the sum is 43.

The square root of 71477845 is about 8454.4571085316. The cubic root of 71477845 is about 415.0086512930.

The spelling of 71477845 in words is "seventy-one million, four hundred seventy-seven thousand, eight hundred forty-five".