78216716 has 6 divisors (see below), whose sum is σ = 136879260. Its totient is φ = 39108356.

The previous prime is 78216707. The next prime is 78216727. The reversal of 78216716 is 61761287.

It is a super-2 number, since 2×78216716² = 12235709323649312, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78216716.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9777086 + ... + 9777093.

It is an arithmetic number, because the mean of its divisors is an integer number (22813210).

Almost surely, 2^78216716 is an apocalyptic number.

It is an amenable number.

78216716 is a deficient number, since it is larger than the sum of its proper divisors (58662544).

78216716 is a wasteful number, since it uses less digits than its factorization.

78216716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19554183 (or 19554181 counting only the distinct ones).

The product of its digits is 28224, while the sum is 38.

The square root of 78216716 is about 8844.0214834655. The cubic root of 78216716 is about 427.6612088794.

The spelling of 78216716 in words is "seventy-eight million, two hundred sixteen thousand, seven hundred sixteen".