71968145 has 16 divisors (see below), whose sum is σ = 89927760. Its totient is φ = 55251072.

The previous prime is 71968129. The next prime is 71968153. The reversal of 71968145 is 54186917.

It can be written as a sum of positive squares in 8 ways, for example, as 1290496 + 70677649 = 1136^2 + 8407^2 .

It is not a de Polignac number, because 71968145 - 2⁴ = 71968129 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 985829 + ... + 985901.

It is an arithmetic number, because the mean of its divisors is an integer number (5620485).

Almost surely, 2^71968145 is an apocalyptic number.

It is an amenable number.

71968145 is a deficient number, since it is larger than the sum of its proper divisors (17959615).

71968145 is an frugal number, since it uses more digits than its factorization.

71968145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261 (or 115 counting only the distinct ones).

The product of its digits is 60480, while the sum is 41.

The square root of 71968145 is about 8483.4040926977. The cubic root of 71968145 is about 415.9554027173.

The spelling of 71968145 in words is "seventy-one million, nine hundred sixty-eight thousand, one hundred forty-five".