78961216 has 28 divisors (see below), whose sum is σ = 161747200. Its totient is φ = 38206080.

The previous prime is 78961199. The next prime is 78961241. The reversal of 78961216 is 61216987.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17916 + ... + 21883.

Almost surely, 2^78961216 is an apocalyptic number.

It is an amenable number.

78961216 is an abundant number, since it is smaller than the sum of its proper divisors (82785984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78961216 is a wasteful number, since it uses less digits than its factorization.

78961216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39842 (or 39832 counting only the distinct ones).

The product of its digits is 36288, while the sum is 40.

The square root of 78961216 is about 8886.0123790146. The cubic root of 78961216 is about 429.0138135061.

The spelling of 78961216 in words is "seventy-eight million, nine hundred sixty-one thousand, two hundred sixteen".