25840980 has 144 divisors (see below), whose sum is σ = 88478208. Its totient is φ = 6048000.

The previous prime is 25840961. The next prime is 25840981. The reversal of 25840980 is 8904852.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25840981) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 61170 + ... + 61590.

It is an arithmetic number, because the mean of its divisors is an integer number (614432).

Almost surely, 2^25840980 is an apocalyptic number.

25840980 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 25840980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44239104).

25840980 is an abundant number, since it is smaller than the sum of its proper divisors (62637228).

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

25840980 is a wasteful number, since it uses less digits than its factorization.

25840980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478 (or 473 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 25840980 is about 5083.4024039023. The cubic root of 25840980 is about 295.6444019257.

The spelling of 25840980 in words is "twenty-five million, eight hundred forty thousand, nine hundred eighty".