71728163 has 12 divisors (see below), whose sum is σ = 79776288. Its totient is φ = 64415520.

The previous prime is 71728109. The next prime is 71728169. The reversal of 71728163 is 36182717.

It is not a de Polignac number, because 71728163 - 2²² = 67533859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71728169) 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, 518 + ... + 11988.

It is an arithmetic number, because the mean of its divisors is an integer number (6648024).

Almost surely, 2^71728163 is an apocalyptic number.

71728163 is a deficient number, since it is larger than the sum of its proper divisors (8048125).

71728163 is a wasteful number, since it uses less digits than its factorization.

71728163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11534 (or 11521 counting only the distinct ones).

The product of its digits is 14112, while the sum is 35.

The square root of 71728163 is about 8469.2480776041. The cubic root of 71728163 is about 415.4925452991.

The spelling of 71728163 in words is "seventy-one million, seven hundred twenty-eight thousand, one hundred sixty-three".