78761871 has 6 divisors (see below), whose sum is σ = 113767160. Its totient is φ = 52507908.

The previous prime is 78761857. The next prime is 78761909. The reversal of 78761871 is 17816787.

It is a happy number.

It is not a de Polignac number, because 78761871 - 2⁶ = 78761807 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 (78761831) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4375651 + ... + 4375668.

Almost surely, 2^78761871 is an apocalyptic number.

78761871 is a deficient number, since it is larger than the sum of its proper divisors (35005289).

78761871 is a wasteful number, since it uses less digits than its factorization.

78761871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8751325 (or 8751322 counting only the distinct ones).

The product of its digits is 131712, while the sum is 45.

The square root of 78761871 is about 8874.7885045222. The cubic root of 78761871 is about 428.6524807179.

The spelling of 78761871 in words is "seventy-eight million, seven hundred sixty-one thousand, eight hundred seventy-one".