240531640 has 64 divisors (see below), whose sum is σ = 603223200. Its totient is φ = 85782528.

The previous prime is 240531527. The next prime is 240531671. The reversal of 240531640 is 46135042.

240531640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3612 + ... + 22228.

Almost surely, 2^240531640 is an apocalyptic number.

240531640 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 240531640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (301611600).

240531640 is an abundant number, since it is smaller than the sum of its proper divisors (362691560).

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

240531640 is a wasteful number, since it uses less digits than its factorization.

240531640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18664 (or 18660 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 240531640 is about 15509.0825002642. The cubic root of 240531640 is about 621.9050319747.

Adding to 240531640 its reverse (46135042), we get a palindrome (286666682).

The spelling of 240531640 in words is "two hundred forty million, five hundred thirty-one thousand, six hundred forty".