24640040 has 48 divisors (see below), whose sum is σ = 57375540. Its totient is φ = 9523200.

The previous prime is 24640027. The next prime is 24640043. The reversal of 24640040 is 4004642.

It can be written as a sum of positive squares in 2 ways, for example, as 23990404 + 649636 = 4898^2 + 806^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 24639994 and 24640021.

It is not an unprimeable number, because it can be changed into a prime (24640043) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38120 + ... + 38760.

Almost surely, 2^24640040 is an apocalyptic number.

24640040 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 24640040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28687770).

24640040 is an abundant number, since it is smaller than the sum of its proper divisors (32735500).

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

24640040 is a wasteful number, since it uses less digits than its factorization.

24640040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714 (or 679 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 24640040 is about 4963.8734875095. The cubic root of 24640040 is about 290.9916114145.

Adding to 24640040 its reverse (4004642), we get a palindrome (28644682).

The spelling of 24640040 in words is "twenty-four million, six hundred forty thousand, forty".