71815825 has 12 divisors (see below), whose sum is σ = 89244288. Its totient is φ = 57328400.

The previous prime is 71815817. The next prime is 71815829. The reversal of 71815825 is 52851817.

It is not a de Polignac number, because 71815825 - 2³ = 71815817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71815829) 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, 9720 + ... + 15430.

It is an arithmetic number, because the mean of its divisors is an integer number (7437024).

Almost surely, 2^71815825 is an apocalyptic number.

It is an amenable number.

71815825 is a deficient number, since it is larger than the sum of its proper divisors (17428463).

71815825 is a wasteful number, since it uses less digits than its factorization.

71815825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6224 (or 6219 counting only the distinct ones).

The product of its digits is 22400, while the sum is 37.

The square root of 71815825 is about 8474.4218091856. The cubic root of 71815825 is about 415.6617400201.

The spelling of 71815825 in words is "seventy-one million, eight hundred fifteen thousand, eight hundred twenty-five".