91230660 has 36 divisors (see below), whose sum is σ = 276733548. Its totient is φ = 24328128.

The previous prime is 91230637. The next prime is 91230679. The reversal of 91230660 is 6603219.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 47114496 + 44116164 = 6864^2 + 6642^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 253239 + ... + 253598.

It is an arithmetic number, because the mean of its divisors is an integer number (7687043).

Almost surely, 2^91230660 is an apocalyptic number.

91230660 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

91230660 is an abundant number, since it is smaller than the sum of its proper divisors (185502888).

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

91230660 is a wasteful number, since it uses less digits than its factorization.

91230660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506852 (or 506847 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 91230660 is about 9551.4742317613. The cubic root of 91230660 is about 450.1738587465.

Adding to 91230660 its reverse (6603219), we get a palindrome (97833879).

The spelling of 91230660 in words is "ninety-one million, two hundred thirty thousand, six hundred sixty".