25131780 has 144 divisors (see below), whose sum is σ = 83026944. Its totient is φ = 6128640.

The previous prime is 25131761. The next prime is 25131781. The reversal of 25131780 is 8713152.

It is not an unprimeable number, because it can be changed into a prime (25131781) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 131485 + ... + 131675.

It is an arithmetic number, because the mean of its divisors is an integer number (576576).

Almost surely, 2^25131780 is an apocalyptic number.

25131780 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 25131780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41513472).

25131780 is an abundant number, since it is smaller than the sum of its proper divisors (57895164).

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

25131780 is a wasteful number, since it uses less digits than its factorization.

25131780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266 (or 261 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 25131780 is about 5013.1606796511. The cubic root of 25131780 is about 292.9146431386.

The spelling of 25131780 in words is "twenty-five million, one hundred thirty-one thousand, seven hundred eighty".