78451216 has 10 divisors (see below), whose sum is σ = 151999262. Its totient is φ = 39225600.

The previous prime is 78451213. The next prime is 78451231. The reversal of 78451216 is 61215487.

It can be written as a sum of positive squares in only one way, i.e., 77369616 + 1081600 = 8796^2 + 1040^2 .

It is not an unprimeable number, because it can be changed into a prime (78451213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2451585 + ... + 2451616.

Almost surely, 2^78451216 is an apocalyptic number.

It is an amenable number.

78451216 is a deficient number, since it is larger than the sum of its proper divisors (73548046).

78451216 is a wasteful number, since it uses less digits than its factorization.

78451216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4903209 (or 4903203 counting only the distinct ones).

The product of its digits is 13440, while the sum is 34.

The square root of 78451216 is about 8857.2691050910. The cubic root of 78451216 is about 428.0881700322.

The spelling of 78451216 in words is "seventy-eight million, four hundred fifty-one thousand, two hundred sixteen".