25520007240 has 576 divisors, whose sum is σ = 106006717440. Its totient is φ = 5208053760.

The previous prime is 25520007217. The next prime is 25520007251. The reversal of 25520007240 is 4270002552.

25520007240 is a `hidden beast` number, since 2 + 552 + 0 + 0 + 0 + 72 + 40 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 13201314 + ... + 13203246.

It is an arithmetic number, because the mean of its divisors is an integer number (184039440).

Almost surely, 2^25520007240 is an apocalyptic number.

25520007240 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 25520007240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53003358720).

25520007240 is an abundant number, since it is smaller than the sum of its proper divisors (80486710200).

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

25520007240 is a wasteful number, since it uses less digits than its factorization.

25520007240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2014 (or 1994 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 27.

Adding to 25520007240 its reverse (4270002552), we get a palindrome (29790009792).

The spelling of 25520007240 in words is "twenty-five billion, five hundred twenty million, seven thousand, two hundred forty".