25550520 has 64 divisors (see below), whose sum is σ = 77220000. Its totient is φ = 6763008.

The previous prime is 25550519. The next prime is 25550531. The reversal of 25550520 is 2505552.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17166 + ... + 18594.

Almost surely, 2^25550520 is an apocalyptic number.

25550520 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 25550520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38610000).

25550520 is an abundant number, since it is smaller than the sum of its proper divisors (51669480).

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

25550520 is a wasteful number, since it uses less digits than its factorization.

25550520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1592 (or 1588 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 24.

The square root of 25550520 is about 5054.7522194466. The cubic root of 25550520 is about 294.5325163013.

The spelling of 25550520 in words is "twenty-five million, five hundred fifty thousand, five hundred twenty".