25543980 has 288 divisors, whose sum is σ = 102735360. Its totient is φ = 4976640.

The previous prime is 25543967. The next prime is 25543993. The reversal of 25543980 is 8934552.

25543980 is a `hidden beast` number, since 25 + 543 + 98 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (25543967) and next prime (25543993).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 263292 + ... + 263388.

It is an arithmetic number, because the mean of its divisors is an integer number (356720).

Almost surely, 2^25543980 is an apocalyptic number.

25543980 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 25543980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51367680).

25543980 is an abundant number, since it is smaller than the sum of its proper divisors (77191380).

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

25543980 is a wasteful number, since it uses less digits than its factorization.

25543980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149 (or 144 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 25543980 is about 5054.1052620617. The cubic root of 25543980 is about 294.5073843010.

The spelling of 25543980 in words is "twenty-five million, five hundred forty-three thousand, nine hundred eighty".