91065620 has 12 divisors (see below), whose sum is σ = 191237844. Its totient is φ = 36426240.

The previous prime is 91065593. The next prime is 91065641. The reversal of 91065620 is 2656019.

It can be written as a sum of positive squares in 2 ways, for example, as 23464336 + 67601284 = 4844^2 + 8222^2 .

It is a congruent number.

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, 2276621 + ... + 2276660.

It is an arithmetic number, because the mean of its divisors is an integer number (15936487).

Almost surely, 2^91065620 is an apocalyptic number.

It is an amenable number.

91065620 is an abundant number, since it is smaller than the sum of its proper divisors (100172224).

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

91065620 is a wasteful number, since it uses less digits than its factorization.

91065620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4553290 (or 4553288 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 91065620 is about 9542.8308169012. The cubic root of 91065620 is about 449.9022339051.

The spelling of 91065620 in words is "ninety-one million, sixty-five thousand, six hundred twenty".