71677987 has 4 divisors (see below), whose sum is σ = 71723880. Its totient is φ = 71632096.

The previous prime is 71677919. The next prime is 71677993. The reversal of 71677987 is 78977617.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78977617 = 127 ⋅621871.

It is a cyclic number.

It is not a de Polignac number, because 71677987 - 2¹¹ = 71675939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71677387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20518 + ... + 23755.

It is an arithmetic number, because the mean of its divisors is an integer number (17930970).

Almost surely, 2^71677987 is an apocalyptic number.

71677987 is a deficient number, since it is larger than the sum of its proper divisors (45893).

71677987 is a wasteful number, since it uses less digits than its factorization.

71677987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45892.

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

The square root of 71677987 is about 8466.2853129339. The cubic root of 71677987 is about 415.3956395363.

The spelling of 71677987 in words is "seventy-one million, six hundred seventy-seven thousand, nine hundred eighty-seven".