25287131778240 has 224 divisors, whose sum is σ = 81334654338240. Its totient is φ = 6655485607936.

The previous prime is 25287131778197. The next prime is 25287131778253. The reversal of 25287131778240 is 4287713178252.

It is a super-4 number, since 4×25287131778240⁴ (a number of 55 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47324404 + ... + 47855756.

Almost surely, 2^{25287131778240} is an apocalyptic number.

25287131778240 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 25287131778240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40667327169120).

25287131778240 is an abundant number, since it is smaller than the sum of its proper divisors (56047522560000).

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

25287131778240 is a wasteful number, since it uses less digits than its factorization.

25287131778240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532019 (or 532009 counting only the distinct ones).

The product of its (nonzero) digits is 10536960, while the sum is 57.

The spelling of 25287131778240 in words is "twenty-five trillion, two hundred eighty-seven billion, one hundred thirty-one million, seven hundred seventy-eight thousand, two hundred forty".