91284645 has 64 divisors (see below), whose sum is σ = 165473280. Its totient is φ = 42697728.

The previous prime is 91284593. The next prime is 91284647. The reversal of 91284645 is 54648219.

It is not a de Polignac number, because 91284645 - 2⁶ = 91284581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91284647) 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 63 ways as a sum of consecutive naturals, for example, 402022 + ... + 402248.

It is an arithmetic number, because the mean of its divisors is an integer number (2585520).

Almost surely, 2^91284645 is an apocalyptic number.

91284645 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

91284645 is a deficient number, since it is larger than the sum of its proper divisors (74188635).

91284645 is a wasteful number, since it uses less digits than its factorization.

91284645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354.

The product of its digits is 69120, while the sum is 39.

The square root of 91284645 is about 9554.2998173597. The cubic root of 91284645 is about 450.2626368090.

The spelling of 91284645 in words is "ninety-one million, two hundred eighty-four thousand, six hundred forty-five".