78563218 has 8 divisors (see below), whose sum is σ = 118148940. Its totient is φ = 39180240.

The previous prime is 78563213. The next prime is 78563249. The reversal of 78563218 is 81236587.

It can be written as a sum of positive squares in 2 ways, for example, as 61199329 + 17363889 = 7823^2 + 4167^2 .

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

It is an alternating number because its digits alternate between odd and even.

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (78563213) 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, 49713 + ... + 51268.

Almost surely, 2^78563218 is an apocalyptic number.

78563218 is a deficient number, since it is larger than the sum of its proper divisors (39585722).

78563218 is a wasteful number, since it uses less digits than its factorization.

78563218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101372.

The product of its digits is 80640, while the sum is 40.

The square root of 78563218 is about 8863.5894534889. The cubic root of 78563218 is about 428.2917952253.

The spelling of 78563218 in words is "seventy-eight million, five hundred sixty-three thousand, two hundred eighteen".