25520000 has 160 divisors (see below), whose sum is σ = 71695800. Its totient is φ = 8960000.

The previous prime is 25519993. The next prime is 25520003. The reversal of 25520000 is 2552.

It is a tau number, because it is divible by the number of its divisors (160).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25520003) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 879986 + ... + 880014.

Almost surely, 2^25520000 is an apocalyptic number.

25520000 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 25520000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35847900).

25520000 is an abundant number, since it is smaller than the sum of its proper divisors (46175800).

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

25520000 is an equidigital number, since it uses as much as digits as its factorization.

25520000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 14.

The square root of 25520000 is about 5051.7323761260. The cubic root of 25520000 is about 294.4151969156.

Adding to 25520000 its reverse (2552), we get a palindrome (25522552).

Multiplying 25520000 by its reverse (2552), we get a square (65127040000 = 255200²).

25520000 divided by its reverse (2552) gives a 4-th power (10000 = 10⁴).

It can be divided in two parts, 25 and 520000, that added together give a palindrome (520025).

The spelling of 25520000 in words is "twenty-five million, five hundred twenty thousand".