91650240 has 252 divisors, whose sum is σ = 347819472. Its totient is φ = 22133760.

The previous prime is 91650227. The next prime is 91650257. The reversal of 91650240 is 4205619.

91650240 is a `hidden beast` number, since 9 + 1 + 650 + 2 + 4 + 0 = 666.

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 35 ways as a sum of consecutive naturals, for example, 348349 + ... + 348611.

It is an arithmetic number, because the mean of its divisors is an integer number (1380236).

Almost surely, 2^91650240 is an apocalyptic number.

91650240 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91650240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173909736).

91650240 is an abundant number, since it is smaller than the sum of its proper divisors (256169232).

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

91650240 is a wasteful number, since it uses less digits than its factorization.

91650240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308 (or 284 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 91650240 is about 9573.4131844395. The cubic root of 91650240 is about 450.8629367352.

Adding to 91650240 its reverse (4205619), we get a palindrome (95855859).

The spelling of 91650240 in words is "ninety-one million, six hundred fifty thousand, two hundred forty".