91644430 has 32 divisors (see below), whose sum is σ = 170644320. Its totient is φ = 35412480.

The previous prime is 91644403. The next prime is 91644431. The reversal of 91644430 is 3444619.

It is a junction number, because it is equal to n+sod(n) for n = 91644392 and 91644401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91644431) 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, 42826 + ... + 44914.

It is an arithmetic number, because the mean of its divisors is an integer number (5332635).

Almost surely, 2^91644430 is an apocalyptic number.

91644430 is a deficient number, since it is larger than the sum of its proper divisors (78999890).

91644430 is a wasteful number, since it uses less digits than its factorization.

91644430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2244.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 91644430 is about 9573.1097350861. The cubic root of 91644430 is about 450.8534093224.

The spelling of 91644430 in words is "ninety-one million, six hundred forty-four thousand, four hundred thirty".