91304538 has 32 divisors (see below), whose sum is σ = 207009600. Its totient is φ = 26614656.

The previous prime is 91304533. The next prime is 91304539. The reversal of 91304538 is 83540319.

It is a junction number, because it is equal to n+sod(n) for n = 91304499 and 91304508.

It is not an unprimeable number, because it can be changed into a prime (91304533) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 29323 + ... + 32286.

It is an arithmetic number, because the mean of its divisors is an integer number (6469050).

Almost surely, 2^91304538 is an apocalyptic number.

91304538 is an abundant number, since it is smaller than the sum of its proper divisors (115705062).

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

91304538 is a wasteful number, since it uses less digits than its factorization.

91304538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61646.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 91304538 is about 9555.3408102485. The cubic root of 91304538 is about 450.2953419226.

The spelling of 91304538 in words is "ninety-one million, three hundred four thousand, five hundred thirty-eight".