25977281720 has 64 divisors (see below), whose sum is σ = 63081486720. Its totient is φ = 9570806784.

The previous prime is 25977281719. The next prime is 25977281747. The reversal of 25977281720 is 2718277952.

It is a super-3 number, since 3×25977281720³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186812 + ... + 294708.

It is an arithmetic number, because the mean of its divisors is an integer number (985648230).

Almost surely, 2^25977281720 is an apocalyptic number.

25977281720 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 25977281720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31540743360).

25977281720 is an abundant number, since it is smaller than the sum of its proper divisors (37104205000).

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

25977281720 is a wasteful number, since it uses less digits than its factorization.

25977281720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108384 (or 108380 counting only the distinct ones).

The product of its (nonzero) digits is 987840, while the sum is 50.

The spelling of 25977281720 in words is "twenty-five billion, nine hundred seventy-seven million, two hundred eighty-one thousand, seven hundred twenty".