91328420506 has 16 divisors (see below), whose sum is σ = 144211498560. Its totient is φ = 43258212000.

The previous prime is 91328420503. The next prime is 91328420507. The reversal of 91328420506 is 60502482319.

It is a super-2 number, since 2×91328420506² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91328420503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 658795 + ... + 785281.

It is an arithmetic number, because the mean of its divisors is an integer number (9013218660).

Almost surely, 2^91328420506 is an apocalyptic number.

91328420506 is a deficient number, since it is larger than the sum of its proper divisors (52883078054).

91328420506 is a wasteful number, since it uses less digits than its factorization.

91328420506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145509.

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 91328420506 in words is "ninety-one billion, three hundred twenty-eight million, four hundred twenty thousand, five hundred six".