91643424 has 24 divisors (see below), whose sum is σ = 240564240. Its totient is φ = 30547776.

The previous prime is 91643423. The next prime is 91643429. The reversal of 91643424 is 42434619.

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (91643423) 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 3 ways as a sum of consecutive naturals, for example, 477214 + ... + 477405.

It is an arithmetic number, because the mean of its divisors is an integer number (10023510).

Almost surely, 2^91643424 is an apocalyptic number.

It is an amenable number.

91643424 is an abundant number, since it is smaller than the sum of its proper divisors (148920816).

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

91643424 is a wasteful number, since it uses less digits than its factorization.

91643424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 954632 (or 954624 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 91643424 is about 9573.0571919319. The cubic root of 91643424 is about 450.8517596124.

The spelling of 91643424 in words is "ninety-one million, six hundred forty-three thousand, four hundred twenty-four".