71987677 has 16 divisors (see below), whose sum is σ = 77841792. Its totient is φ = 66401280.

The previous prime is 71987651. The next prime is 71987687. The reversal of 71987677 is 77678917.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71987677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71987687) 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, 91078 + ... + 91864.

It is an arithmetic number, because the mean of its divisors is an integer number (4865112).

Almost surely, 2^71987677 is an apocalyptic number.

It is an amenable number.

71987677 is a deficient number, since it is larger than the sum of its proper divisors (5854115).

71987677 is a wasteful number, since it uses less digits than its factorization.

71987677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948.

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

The square root of 71987677 is about 8484.5552034270. Note that the first 3 decimals coincide. The cubic root of 71987677 is about 415.9930291146.

The spelling of 71987677 in words is "seventy-one million, nine hundred eighty-seven thousand, six hundred seventy-seven".