71564427 has 24 divisors (see below), whose sum is σ = 115397568. Its totient is φ = 42361200.

The previous prime is 71564419. The next prime is 71564429. The reversal of 71564427 is 72446517.

71564427 is a `hidden beast` number, since 7 + 1 + 5 + 644 + 2 + 7 = 666.

It is not a de Polignac number, because 71564427 - 2³ = 71564419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71564391 and 71564400.

It is not an unprimeable number, because it can be changed into a prime (71564429) 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, 4149 + ... + 12662.

It is an arithmetic number, because the mean of its divisors is an integer number (4808232).

Almost surely, 2^71564427 is an apocalyptic number.

71564427 is a deficient number, since it is larger than the sum of its proper divisors (43833141).

71564427 is a wasteful number, since it uses less digits than its factorization.

71564427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16871 (or 16868 counting only the distinct ones).

The product of its digits is 47040, while the sum is 36.

The square root of 71564427 is about 8459.5760532074. The cubic root of 71564427 is about 415.1761520545.

The spelling of 71564427 in words is "seventy-one million, five hundred sixty-four thousand, four hundred twenty-seven".