91828640 has 24 divisors (see below), whose sum is σ = 216945540. Its totient is φ = 36731392.

The previous prime is 91828619. The next prime is 91828651. The reversal of 91828640 is 4682819.

It can be written as a sum of positive squares in 2 ways, for example, as 89946256 + 1882384 = 9484^2 + 1372^2 .

It is a junction number, because it is equal to n+sod(n) for n = 91828594 and 91828603.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 286805 + ... + 287124.

Almost surely, 2^91828640 is an apocalyptic number.

It is an amenable number.

91828640 is an abundant number, since it is smaller than the sum of its proper divisors (125116900).

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

91828640 is a wasteful number, since it uses less digits than its factorization.

91828640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573944 (or 573936 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 91828640 is about 9582.7261256910. The cubic root of 91828640 is about 451.1552866343.

The spelling of 91828640 in words is "ninety-one million, eight hundred twenty-eight thousand, six hundred forty".