25752681540 has 480 divisors, whose sum is σ = 88987852800. Its totient is φ = 6207860736.

The previous prime is 25752681517. The next prime is 25752681541. The reversal of 25752681540 is 4518625752.

25752681540 is a `hidden beast` number, since 2 + 5 + 7 + 5 + 26 + 81 + 540 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (25752681541) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 129410361 + ... + 129410559.

It is an arithmetic number, because the mean of its divisors is an integer number (185391360).

Almost surely, 2^25752681540 is an apocalyptic number.

25752681540 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 25752681540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44493926400).

25752681540 is an abundant number, since it is smaller than the sum of its proper divisors (63235171260).

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

25752681540 is a wasteful number, since it uses less digits than its factorization.

25752681540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401 (or 390 counting only the distinct ones).

The product of its (nonzero) digits is 672000, while the sum is 45.

The spelling of 25752681540 in words is "twenty-five billion, seven hundred fifty-two million, six hundred eighty-one thousand, five hundred forty".