91288650 has 24 divisors (see below), whose sum is σ = 226396224. Its totient is φ = 24343600.

The previous prime is 91288649. The next prime is 91288661. The reversal of 91288650 is 5688219.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 91288599 and 91288608.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 304146 + ... + 304445.

It is an arithmetic number, because the mean of its divisors is an integer number (9433176).

Almost surely, 2^91288650 is an apocalyptic number.

91288650 is an abundant number, since it is smaller than the sum of its proper divisors (135107574).

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

91288650 is a wasteful number, since it uses less digits than its factorization.

91288650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608606 (or 608601 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 91288650 is about 9554.5094065577. The cubic root of 91288650 is about 450.2692216166.

The spelling of 91288650 in words is "ninety-one million, two hundred eighty-eight thousand, six hundred fifty".