25644326400 has 1440 divisors, whose sum is σ = 118733472000. Its totient is φ = 5238374400.

The previous prime is 25644326387. The next prime is 25644326419. The reversal of 25644326400 is 462344652.

25644326400 is a `hidden beast` number, since 2 + 5 + 6 + 4 + 4 + 3 + 2 + 640 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1440).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 434649571 + ... + 434649629.

It is an arithmetic number, because the mean of its divisors is an integer number (82453800).

Almost surely, 2^25644326400 is an apocalyptic number.

25644326400 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 25644326400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59366736000).

25644326400 is an abundant number, since it is smaller than the sum of its proper divisors (93089145600).

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

25644326400 is a wasteful number, since it uses less digits than its factorization.

25644326400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125 (or 87 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 36.

The spelling of 25644326400 in words is "twenty-five billion, six hundred forty-four million, three hundred twenty-six thousand, four hundred".