240816640 has 80 divisors (see below), whose sum is σ = 607907520. Its totient is φ = 91238400.

The previous prime is 240816619. The next prime is 240816671. The reversal of 240816640 is 46618042.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46165 + ... + 51115.

It is an arithmetic number, because the mean of its divisors is an integer number (7598844).

Almost surely, 2^240816640 is an apocalyptic number.

240816640 is a gapful number since it is divisible by the number (20) 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 240816640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (303953760).

240816640 is an abundant number, since it is smaller than the sum of its proper divisors (367090880).

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

240816640 is an equidigital number, since it uses as much as digits as its factorization.

240816640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4993 (or 4977 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 240816640 is about 15518.2679445871. The cubic root of 240816640 is about 622.1505616641.

The spelling of 240816640 in words is "two hundred forty million, eight hundred sixteen thousand, six hundred forty".