25155520 has 56 divisors (see below), whose sum is σ = 64520064. Its totient is φ = 9286656.

The previous prime is 25155517. The next prime is 25155527. The reversal of 25155520 is 2555152.

It is a happy number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25155527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1137 + ... + 7183.

It is an arithmetic number, because the mean of its divisors is an integer number (1152144).

Almost surely, 2^25155520 is an apocalyptic number.

25155520 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 25155520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32260032).

25155520 is an abundant number, since it is smaller than the sum of its proper divisors (39364544).

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

25155520 is a wasteful number, since it uses less digits than its factorization.

25155520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6077 (or 6067 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 25155520 is about 5015.5278884680. The cubic root of 25155520 is about 293.0068451926.

The spelling of 25155520 in words is "twenty-five million, one hundred fifty-five thousand, five hundred twenty".