78641216 has 28 divisors (see below), whose sum is σ = 156336492. Its totient is φ = 39249408.

The previous prime is 78641207. The next prime is 78641231. The reversal of 78641216 is 61214687.

It can be written as a sum of positive squares in 2 ways, for example, as 1201216 + 77440000 = 1096^2 + 8800^2 .

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 in 3 ways as a sum of consecutive naturals, for example, 64226 + ... + 65438.

Almost surely, 2^78641216 is an apocalyptic number.

It is an amenable number.

78641216 is a deficient number, since it is larger than the sum of its proper divisors (77695276).

78641216 is a wasteful number, since it uses less digits than its factorization.

78641216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2238 (or 2228 counting only the distinct ones).

The product of its digits is 16128, while the sum is 35.

The square root of 78641216 is about 8867.9882724325. The cubic root of 78641216 is about 428.4334851713.

The spelling of 78641216 in words is "seventy-eight million, six hundred forty-one thousand, two hundred sixteen".