25188780 has 72 divisors (see below), whose sum is σ = 72675792. Its totient is φ = 6516224.

The previous prime is 25188773. The next prime is 25188797. The reversal of 25188780 is 8788152.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 282976 + ... + 283064.

It is an arithmetic number, because the mean of its divisors is an integer number (1009386).

Almost surely, 2^25188780 is an apocalyptic number.

25188780 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 25188780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36337896).

25188780 is an abundant number, since it is smaller than the sum of its proper divisors (47487012).

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

25188780 is a wasteful number, since it uses less digits than its factorization.

25188780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243 (or 152 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 39.

The square root of 25188780 is about 5018.8424960343. The cubic root of 25188780 is about 293.1359237643.

It can be divided in two parts, 25 and 188780, that added together give a triangular number (188805 = T₆₁₄).

The spelling of 25188780 in words is "twenty-five million, one hundred eighty-eight thousand, seven hundred eighty".