25349936280 has 128 divisors (see below), whose sum is σ = 78565939200. Its totient is φ = 6536678400.

The previous prime is 25349936263. The next prime is 25349936299. The reversal of 25349936280 is 8263994352.

It is a happy number.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 7181556 + ... + 7185084.

It is an arithmetic number, because the mean of its divisors is an integer number (613796400).

Almost surely, 2^25349936280 is an apocalyptic number.

25349936280 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 25349936280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39282969600).

25349936280 is an abundant number, since it is smaller than the sum of its proper divisors (53216002920).

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

25349936280 is a wasteful number, since it uses less digits than its factorization.

25349936280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5505 (or 5501 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 51.

The spelling of 25349936280 in words is "twenty-five billion, three hundred forty-nine million, nine hundred thirty-six thousand, two hundred eighty".