25980864 has 112 divisors (see below), whose sum is σ = 84661248. Its totient is φ = 6847488.

The previous prime is 25980863. The next prime is 25980881. The reversal of 25980864 is 46808952.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25980863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16729 + ... + 18215.

It is an arithmetic number, because the mean of its divisors is an integer number (755904).

Almost surely, 2^25980864 is an apocalyptic number.

25980864 is a gapful number since it is divisible by the number (24) 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 25980864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42330624).

25980864 is an abundant number, since it is smaller than the sum of its proper divisors (58680384).

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

25980864 is a wasteful number, since it uses less digits than its factorization.

25980864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1522 (or 1512 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 25980864 is about 5097.1427290199. The cubic root of 25980864 is about 296.1769090991.

The spelling of 25980864 in words is "twenty-five million, nine hundred eighty thousand, eight hundred sixty-four".