25381620 has 96 divisors (see below), whose sum is σ = 86163840. Its totient is φ = 6151680.

The previous prime is 25381619. The next prime is 25381639. The reversal of 25381620 is 2618352.

25381620 is a `hidden beast` number, since 2 + 5 + 38 + 1 + 620 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

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, 3804 + ... + 8076.

It is an arithmetic number, because the mean of its divisors is an integer number (897540).

Almost surely, 2^25381620 is an apocalyptic number.

25381620 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 25381620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43081920).

25381620 is an abundant number, since it is smaller than the sum of its proper divisors (60782220).

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

25381620 is a wasteful number, since it uses less digits than its factorization.

25381620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4302 (or 4294 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 25381620 is about 5038.0174672186. The cubic root of 25381620 is about 293.8820851589.

Adding to 25381620 its reverse (2618352), we get a palindrome (27999972).

The spelling of 25381620 in words is "twenty-five million, three hundred eighty-one thousand, six hundred twenty".