91428648 has 32 divisors (see below), whose sum is σ = 236455200. Its totient is φ = 29425088.

The previous prime is 91428643. The next prime is 91428653. The reversal of 91428648 is 84682419.

It is an interprime number because it is at equal distance from previous prime (91428643) and next prime (91428653).

It is not an unprimeable number, because it can be changed into a prime (91428643) 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 7 ways as a sum of consecutive naturals, for example, 64986 + ... + 66377.

It is an arithmetic number, because the mean of its divisors is an integer number (7389225).

Almost surely, 2^91428648 is an apocalyptic number.

It is an amenable number.

91428648 is an abundant number, since it is smaller than the sum of its proper divisors (145026552).

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

91428648 is a wasteful number, since it uses less digits than its factorization.

91428648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131401 (or 131397 counting only the distinct ones).

The product of its digits is 110592, while the sum is 42.

The square root of 91428648 is about 9561.8328786902. The cubic root of 91428648 is about 450.4992779418.

The spelling of 91428648 in words is "ninety-one million, four hundred twenty-eight thousand, six hundred forty-eight".