65091240 has 96 divisors (see below), whose sum is σ = 216103680. Its totient is φ = 16983936.

The previous prime is 65091239. The next prime is 65091241. The reversal of 65091240 is 4219056.

65091240 is a `hidden beast` number, since 650 + 9 + 1 + 2 + 4 + 0 = 666.

65091240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (65091239) and next prime (65091241).

It is not an unprimeable number, because it can be changed into a prime (65091241) 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 23 ways as a sum of consecutive naturals, for example, 14997 + ... + 18843.

It is an arithmetic number, because the mean of its divisors is an integer number (2251080).

Almost surely, 2^65091240 is an apocalyptic number.

65091240 is a gapful number since it is divisible by the number (60) 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 65091240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108051840).

65091240 is an abundant number, since it is smaller than the sum of its proper divisors (151012440).

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

65091240 is a wasteful number, since it uses less digits than its factorization.

65091240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3911 (or 3904 counting only the distinct ones).

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

The square root of 65091240 is about 8067.9142285971. The cubic root of 65091240 is about 402.2606166298.

The spelling of 65091240 in words is "sixty-five million, ninety-one thousand, two hundred forty".