71824561 has 16 divisors (see below), whose sum is σ = 78019200. Its totient is φ = 65916928.

The previous prime is 71824559. The next prime is 71824567. The reversal of 71824561 is 16542817.

It is a cyclic number.

It is not a de Polignac number, because 71824561 - 2¹ = 71824559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71824567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171210 + ... + 171628.

It is an arithmetic number, because the mean of its divisors is an integer number (4876200).

Almost surely, 2^71824561 is an apocalyptic number.

It is an amenable number.

71824561 is a deficient number, since it is larger than the sum of its proper divisors (6194639).

71824561 is a wasteful number, since it uses less digits than its factorization.

71824561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728.

The product of its digits is 13440, while the sum is 34.

The square root of 71824561 is about 8474.9372269062. The cubic root of 71824561 is about 415.6785936580.

The spelling of 71824561 in words is "seventy-one million, eight hundred twenty-four thousand, five hundred sixty-one".