71285823 has 24 divisors (see below), whose sum is σ = 117899808. Its totient is φ = 40658112.

The previous prime is 71285803. The next prime is 71285831. The reversal of 71285823 is 32858217.

71285823 is a `hidden beast` number, since 71 + 2 + 8 + 582 + 3 = 666.

It is not a de Polignac number, because 71285823 - 2⁹ = 71285311 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71285803) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63261 + ... + 64377.

It is an arithmetic number, because the mean of its divisors is an integer number (4912492).

Almost surely, 2^71285823 is an apocalyptic number.

71285823 is a deficient number, since it is larger than the sum of its proper divisors (46613985).

71285823 is a wasteful number, since it uses less digits than its factorization.

71285823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2143 (or 2140 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 71285823 is about 8443.0932127983. The cubic root of 71285823 is about 414.6366840080.

The spelling of 71285823 in words is "seventy-one million, two hundred eighty-five thousand, eight hundred twenty-three".