25505380 has 12 divisors (see below), whose sum is σ = 53561340. Its totient is φ = 10202144.

The previous prime is 25505377. The next prime is 25505383. The reversal of 25505380 is 8350552.

It is an interprime number because it is at equal distance from previous prime (25505377) and next prime (25505383).

It can be written as a sum of positive squares in 2 ways, for example, as 10201636 + 15303744 = 3194^2 + 3912^2 .

It is not an unprimeable number, because it can be changed into a prime (25505383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 637615 + ... + 637654.

It is an arithmetic number, because the mean of its divisors is an integer number (4463445).

Almost surely, 2^25505380 is an apocalyptic number.

25505380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25505380 is an abundant number, since it is smaller than the sum of its proper divisors (28055960).

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

25505380 is a wasteful number, since it uses less digits than its factorization.

25505380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275278 (or 1275276 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 25505380 is about 5050.2851404648. The cubic root of 25505380 is about 294.3589642562.

The spelling of 25505380 in words is "twenty-five million, five hundred five thousand, three hundred eighty".