71678771 has 4 divisors (see below), whose sum is σ = 71788200. Its totient is φ = 71569344.

The previous prime is 71678767. The next prime is 71678797. The reversal of 71678771 is 17787617.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17787617 = 251 ⋅70867.

It is a cyclic number.

It is not a de Polignac number, because 71678771 - 2² = 71678767 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71678471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53726 + ... + 55043.

It is an arithmetic number, because the mean of its divisors is an integer number (17947050).

Almost surely, 2^71678771 is an apocalyptic number.

71678771 is a deficient number, since it is larger than the sum of its proper divisors (109429).

71678771 is a wasteful number, since it uses less digits than its factorization.

71678771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109428.

The product of its digits is 115248, while the sum is 44.

The square root of 71678771 is about 8466.3316141054. The cubic root of 71678771 is about 415.3971540366.

The spelling of 71678771 in words is "seventy-one million, six hundred seventy-eight thousand, seven hundred seventy-one".