25697840 has 80 divisors (see below), whose sum is σ = 69072960. Its totient is φ = 8709120.

The previous prime is 25697827. The next prime is 25697873. The reversal of 25697840 is 4879652.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60830 + ... + 61250.

It is an arithmetic number, because the mean of its divisors is an integer number (863412).

Almost surely, 2^25697840 is an apocalyptic number.

25697840 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 25697840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34536480).

25697840 is an abundant number, since it is smaller than the sum of its proper divisors (43375120).

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

25697840 is a wasteful number, since it uses less digits than its factorization.

25697840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550 (or 544 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 25697840 is about 5069.3036997205. The cubic root of 25697840 is about 295.0975067887.

The spelling of 25697840 in words is "twenty-five million, six hundred ninety-seven thousand, eight hundred forty".