25321887388 has 72 divisors (see below), whose sum is σ = 53282683440. Its totient is φ = 10493118720.

The previous prime is 25321887361. The next prime is 25321887389. The reversal of 25321887388 is 88378812352.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25321887389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 687456 + ... + 723352.

It is an arithmetic number, because the mean of its divisors is an integer number (740037270).

Almost surely, 2^25321887388 is an apocalyptic number.

25321887388 is a gapful number since it is divisible by the number (28) 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 25321887388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26641341720).

25321887388 is an abundant number, since it is smaller than the sum of its proper divisors (27960796052).

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

25321887388 is a wasteful number, since it uses less digits than its factorization.

25321887388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36035 (or 36026 counting only the distinct ones).

The product of its digits is 5160960, while the sum is 55.

The spelling of 25321887388 in words is "twenty-five billion, three hundred twenty-one million, eight hundred eighty-seven thousand, three hundred eighty-eight".