25913699280 has 640 divisors, whose sum is σ = 104907571200. Its totient is φ = 5757696000.

The previous prime is 25913699263. The next prime is 25913699291. The reversal of 25913699280 is 8299631952.

It is a happy number.

25913699280 is a `hidden beast` number, since 259 + 1 + 369 + 9 + 28 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 108425401 + ... + 108425639.

It is an arithmetic number, because the mean of its divisors is an integer number (163918080).

Almost surely, 2^25913699280 is an apocalyptic number.

25913699280 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 25913699280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52453785600).

25913699280 is an abundant number, since it is smaller than the sum of its proper divisors (78993871920).

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

25913699280 is a wasteful number, since it uses less digits than its factorization.

25913699280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440 (or 428 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 54.

The spelling of 25913699280 in words is "twenty-five billion, nine hundred thirteen million, six hundred ninety-nine thousand, two hundred eighty".