25855520 has 48 divisors (see below), whose sum is σ = 62256600. Its totient is φ = 10143744.

The previous prime is 25855507. The next prime is 25855537. The reversal of 25855520 is 2555852.

It can be written as a sum of positive squares in 4 ways, for example, as 18215824 + 7639696 = 4268^2 + 2764^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6956 + ... + 10004.

Almost surely, 2^25855520 is an apocalyptic number.

25855520 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 25855520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31128300).

25855520 is an abundant number, since it is smaller than the sum of its proper divisors (36401080).

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

25855520 is a wasteful number, since it uses less digits than its factorization.

25855520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3117 (or 3109 counting only the distinct ones).

The product of its (nonzero) digits is 20000, while the sum is 32.

The square root of 25855520 is about 5084.8323472854. The cubic root of 25855520 is about 295.6998418201.

The spelling of 25855520 in words is "twenty-five million, eight hundred fifty-five thousand, five hundred twenty".