91078216 has 16 divisors (see below), whose sum is σ = 171325440. Its totient is φ = 45391440.

The previous prime is 91078213. The next prime is 91078223. The reversal of 91078216 is 61287019.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (91078213) 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, 15816 + ... + 20791.

It is an arithmetic number, because the mean of its divisors is an integer number (10707840).

Almost surely, 2^91078216 is an apocalyptic number.

It is an amenable number.

91078216 is a deficient number, since it is larger than the sum of its proper divisors (80247224).

91078216 is a wasteful number, since it uses less digits than its factorization.

91078216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36924 (or 36920 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 91078216 is about 9543.4907659619. The cubic root of 91078216 is about 449.9229761174.

The spelling of 91078216 in words is "ninety-one million, seventy-eight thousand, two hundred sixteen".