78667671 has 8 divisors (see below), whose sum is σ = 105222384. Its totient is φ = 52279040.

The previous prime is 78667651. The next prime is 78667681. The reversal of 78667671 is 17676687.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78667671 - 2⁹ = 78667159 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78667671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78667601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40410 + ... + 42311.

It is an arithmetic number, because the mean of its divisors is an integer number (13152798).

Almost surely, 2^78667671 is an apocalyptic number.

78667671 is a deficient number, since it is larger than the sum of its proper divisors (26554713).

78667671 is a wasteful number, since it uses less digits than its factorization.

78667671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83041.

The product of its digits is 592704, while the sum is 48.

The square root of 78667671 is about 8869.4797479897. The cubic root of 78667671 is about 428.4815216324.

The spelling of 78667671 in words is "seventy-eight million, six hundred sixty-seven thousand, six hundred seventy-one".