78665716 has 24 divisors (see below), whose sum is σ = 141515136. Its totient is φ = 38239680.

The previous prime is 78665707. The next prime is 78665753. The reversal of 78665716 is 61756687.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59535 + ... + 60841.

It is an arithmetic number, because the mean of its divisors is an integer number (5896464).

Almost surely, 2^78665716 is an apocalyptic number.

It is an amenable number.

78665716 is a deficient number, since it is larger than the sum of its proper divisors (62849420).

78665716 is a wasteful number, since it uses less digits than its factorization.

78665716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1719 (or 1717 counting only the distinct ones).

The product of its digits is 423360, while the sum is 46.

The square root of 78665716 is about 8869.3695379097. The cubic root of 78665716 is about 428.4779721510.

The spelling of 78665716 in words is "seventy-eight million, six hundred sixty-five thousand, seven hundred sixteen".