91820216 has 16 divisors (see below), whose sum is σ = 172322640. Its totient is φ = 45867520.

The previous prime is 91820159. The next prime is 91820219. The reversal of 91820216 is 61202819.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91820219) 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, 5021 + ... + 14451.

It is an arithmetic number, because the mean of its divisors is an integer number (10770165).

Almost surely, 2^91820216 is an apocalyptic number.

It is an amenable number.

91820216 is a deficient number, since it is larger than the sum of its proper divisors (80502424).

91820216 is a wasteful number, since it uses less digits than its factorization.

91820216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10654 (or 10650 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 91820216 is about 9582.2865747169. The cubic root of 91820216 is about 451.1414904724.

The spelling of 91820216 in words is "ninety-one million, eight hundred twenty thousand, two hundred sixteen".