25798978758 has 64 divisors (see below), whose sum is σ = 60780395520. Its totient is φ = 7148131200.

The previous prime is 25798978693. The next prime is 25798978759. The reversal of 25798978758 is 85787989752.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 25798978758.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25798978759) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 110988 + ... + 252816.

It is an arithmetic number, because the mean of its divisors is an integer number (949693680).

Almost surely, 2^25798978758 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25798978758, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30390197760).

25798978758 is an abundant number, since it is smaller than the sum of its proper divisors (34981416762).

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

25798978758 is a wasteful number, since it uses less digits than its factorization.

25798978758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141973.

The product of its digits is 711244800, while the sum is 75.

The spelling of 25798978758 in words is "twenty-five billion, seven hundred ninety-eight million, nine hundred seventy-eight thousand, seven hundred fifty-eight".