25553320 has 64 divisors (see below), whose sum is σ = 62511120. Its totient is φ = 9345024.

The previous prime is 25553287. The next prime is 25553357. The reversal of 25553320 is 2335552.

It can be written as a sum of positive squares in 8 ways, for example, as 91204 + 25462116 = 302^2 + 5046^2 .

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, 81484 + ... + 81796.

Almost surely, 2^25553320 is an apocalyptic number.

25553320 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 25553320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31255560).

25553320 is an abundant number, since it is smaller than the sum of its proper divisors (36957800).

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

25553320 is a wasteful number, since it uses less digits than its factorization.

25553320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494 (or 490 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 25.

The square root of 25553320 is about 5055.0291789464. The cubic root of 25553320 is about 294.5432748681.

Adding to 25553320 its reverse (2335552), we get a palindrome (27888872).

The spelling of 25553320 in words is "twenty-five million, five hundred fifty-three thousand, three hundred twenty".