77968871 has 4 divisors (see below), whose sum is σ = 78009912. Its totient is φ = 77927832.

The previous prime is 77968861. The next prime is 77968889. The reversal of 77968871 is 17886977.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77968871 - 2¹⁴ = 77952487 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 (77968801) 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, 17525 + ... + 21518.

It is an arithmetic number, because the mean of its divisors is an integer number (19502478).

Almost surely, 2^77968871 is an apocalyptic number.

77968871 is a deficient number, since it is larger than the sum of its proper divisors (41041).

77968871 is a wasteful number, since it uses less digits than its factorization.

77968871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41040.

The product of its digits is 1185408, while the sum is 53.

The square root of 77968871 is about 8829.9983578707. The cubic root of 77968871 is about 427.2090214649.

The spelling of 77968871 in words is "seventy-seven million, nine hundred sixty-eight thousand, eight hundred seventy-one".