25781562528 has 96 divisors (see below), whose sum is σ = 69155856000. Its totient is φ = 8406967296.

The previous prime is 25781562493. The next prime is 25781562553. The reversal of 25781562528 is 82526518752.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1768453 + ... + 1782971.

It is an arithmetic number, because the mean of its divisors is an integer number (720373500).

Almost surely, 2^25781562528 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25781562528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34577928000).

25781562528 is an abundant number, since it is smaller than the sum of its proper divisors (43374293472).

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

25781562528 is a wasteful number, since it uses less digits than its factorization.

25781562528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14934 (or 14926 counting only the distinct ones).

The product of its digits is 2688000, while the sum is 51.

The spelling of 25781562528 in words is "twenty-five billion, seven hundred eighty-one million, five hundred sixty-two thousand, five hundred twenty-eight".