78671766 has 8 divisors (see below), whose sum is σ = 157343544. Its totient is φ = 26223920.

The previous prime is 78671759. The next prime is 78671771. The reversal of 78671766 is 66717687.

It is a happy number.

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

78671766 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6555975 + ... + 6555986.

It is an arithmetic number, because the mean of its divisors is an integer number (19667943).

Almost surely, 2^78671766 is an apocalyptic number.

78671766 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78671766 is a wasteful number, since it uses less digits than its factorization.

78671766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13111966.

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

The square root of 78671766 is about 8869.7105927984. The cubic root of 78671766 is about 428.4889562892.

The spelling of 78671766 in words is "seventy-eight million, six hundred seventy-one thousand, seven hundred sixty-six".