25999800 has 96 divisors (see below), whose sum is σ = 85374000. Its totient is φ = 6522880.

The previous prime is 25999751. The next prime is 25999807. The reversal of 25999800 is 899952.

It is a Cunningham number, because it is equal to 5099²-1.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25999807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8926 + ... + 11474.

Almost surely, 2^25999800 is an apocalyptic number.

25999800 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 25999800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42687000).

25999800 is an abundant number, since it is smaller than the sum of its proper divisors (59374200).

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

25999800 is a wasteful number, since it uses less digits than its factorization.

25999800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2585 (or 2576 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 42.

The square root of 25999800 is about 5098.9999019416. Note that the first 4 decimals coincide. The cubic root of 25999800 is about 296.2488472244.

The spelling of 25999800 in words is "twenty-five million, nine hundred ninety-nine thousand, eight hundred".