71767897 has 4 divisors (see below), whose sum is σ = 75989556. Its totient is φ = 67546240.

The previous prime is 71767879. The next prime is 71767907. The reversal of 71767897 is 79876717.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79876717 = 193 ⋅413869.

It can be written as a sum of positive squares in 2 ways, for example, as 44769481 + 26998416 = 6691^2 + 5196^2 .

It is a cyclic number.

It is not a de Polignac number, because 71767897 - 2²³ = 63379289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71777897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2110804 + ... + 2110837.

It is an arithmetic number, because the mean of its divisors is an integer number (18997389).

Almost surely, 2^71767897 is an apocalyptic number.

It is an amenable number.

71767897 is a deficient number, since it is larger than the sum of its proper divisors (4221659).

71767897 is a wasteful number, since it uses less digits than its factorization.

71767897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4221658.

The product of its digits is 1037232, while the sum is 52.

The square root of 71767897 is about 8471.5935336866. The cubic root of 71767897 is about 415.5692521908.

The spelling of 71767897 in words is "seventy-one million, seven hundred sixty-seven thousand, eight hundred ninety-seven".