78216863 has 8 divisors (see below), whose sum is σ = 82416000. Its totient is φ = 74026008.

The previous prime is 78216851. The next prime is 78216877. The reversal of 78216863 is 36861287.

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 a de Polignac number, because none of the positive numbers 2^k-78216863 is a prime.

It is a super-2 number, since 2×78216863² = 12235755315121538, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78216863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78218863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31070 + ... + 33492.

It is an arithmetic number, because the mean of its divisors is an integer number (10302000).

Almost surely, 2^78216863 is an apocalyptic number.

78216863 is a deficient number, since it is larger than the sum of its proper divisors (4199137).

78216863 is a wasteful number, since it uses less digits than its factorization.

78216863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4141.

The product of its digits is 96768, while the sum is 41.

The square root of 78216863 is about 8844.0297941606. The cubic root of 78216863 is about 427.6614767938.

The spelling of 78216863 in words is "seventy-eight million, two hundred sixteen thousand, eight hundred sixty-three".