25920005540 has 192 divisors, whose sum is σ = 65090753280. Its totient is φ = 8546549760.

The previous prime is 25920005539. The next prime is 25920005563. The reversal of 25920005540 is 4550002952.

It is a junction number, because it is equal to n+sod(n) for n = 25920005497 and 25920005506.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 44921732 + ... + 44922308.

It is an arithmetic number, because the mean of its divisors is an integer number (339014340).

Almost surely, 2^25920005540 is an apocalyptic number.

25920005540 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 25920005540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32545376640).

25920005540 is an abundant number, since it is smaller than the sum of its proper divisors (39170747740).

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

25920005540 is a wasteful number, since it uses less digits than its factorization.

25920005540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862 (or 860 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 32.

The spelling of 25920005540 in words is "twenty-five billion, nine hundred twenty million, five thousand, five hundred forty".