25555420 has 48 divisors (see below), whose sum is σ = 61998048. Its totient is φ = 8744960.

The previous prime is 25555393. The next prime is 25555427. The reversal of 25555420 is 2455552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25555427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 324 + ... + 7156.

It is an arithmetic number, because the mean of its divisors is an integer number (1291626).

Almost surely, 2^25555420 is an apocalyptic number.

25555420 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 25555420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30999024).

25555420 is an abundant number, since it is smaller than the sum of its proper divisors (36442628).

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

25555420 is a wasteful number, since it uses less digits than its factorization.

25555420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6870 (or 6868 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 28.

The square root of 25555420 is about 5055.2368886136. The cubic root of 25555420 is about 294.5513432774.

The spelling of 25555420 in words is "twenty-five million, five hundred fifty-five thousand, four hundred twenty".