2520304440 has 128 divisors (see below), whose sum is σ = 7826656320. Its totient is φ = 648806400.

The previous prime is 2520304393. The next prime is 2520304441. The reversal of 2520304440 is 444030252.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 2520304440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2520304441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 474600 + ... + 479880.

Almost surely, 2^2520304440 is an apocalyptic number.

2520304440 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 2520304440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3913328160).

2520304440 is an abundant number, since it is smaller than the sum of its proper divisors (5306351880).

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

2520304440 is a wasteful number, since it uses less digits than its factorization.

2520304440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5433 (or 5429 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 24.

The square root of 2520304440 is about 50202.6337954494. The cubic root of 2520304440 is about 1360.8732209259.

Adding to 2520304440 its reverse (444030252), we get a palindrome (2964334692).

The spelling of 2520304440 in words is "two billion, five hundred twenty million, three hundred four thousand, four hundred forty".