78671611 has 4 divisors (see below), whose sum is σ = 78923272. Its totient is φ = 78419952.

The previous prime is 78671591. The next prime is 78671623. The reversal of 78671611 is 11617687.

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 78671611 - 2¹⁵ = 78638843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78671641) 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, 125361 + ... + 125986.

It is an arithmetic number, because the mean of its divisors is an integer number (19730818).

Almost surely, 2^78671611 is an apocalyptic number.

78671611 is a deficient number, since it is larger than the sum of its proper divisors (251661).

78671611 is a wasteful number, since it uses less digits than its factorization.

78671611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251660.

The product of its digits is 14112, while the sum is 37.

The square root of 78671611 is about 8869.7018551922. The cubic root of 78671611 is about 428.4886748844.

The spelling of 78671611 in words is "seventy-eight million, six hundred seventy-one thousand, six hundred eleven".