24640240 has 20 divisors (see below), whose sum is σ = 57288744. Its totient is φ = 9856064.

The previous prime is 24640237. The next prime is 24640241. The reversal of 24640240 is 4204642.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (24640241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153922 + ... + 154081.

Almost surely, 2^24640240 is an apocalyptic number.

24640240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

24640240 is an abundant number, since it is smaller than the sum of its proper divisors (32648504).

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

24640240 is a wasteful number, since it uses less digits than its factorization.

24640240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308016 (or 308010 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 24640240 is about 4963.8936330264. The cubic root of 24640240 is about 290.9923987260.

Adding to 24640240 its reverse (4204642), we get a palindrome (28844882).

The spelling of 24640240 in words is "twenty-four million, six hundred forty thousand, two hundred forty".