25280540 has 12 divisors (see below), whose sum is σ = 53089176. Its totient is φ = 10112208.

The previous prime is 25280533. The next prime is 25280551. The reversal of 25280540 is 4508252.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 631994 + ... + 632033.

It is an arithmetic number, because the mean of its divisors is an integer number (4424098).

Almost surely, 2^25280540 is an apocalyptic number.

25280540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25280540 is an abundant number, since it is smaller than the sum of its proper divisors (27808636).

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

25280540 is a wasteful number, since it uses less digits than its factorization.

25280540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1264036 (or 1264034 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 25280540 is about 5027.9757358205. The cubic root of 25280540 is about 293.4914465534.

Adding to 25280540 its reverse (4508252), we get a palindrome (29788792).

The spelling of 25280540 in words is "twenty-five million, two hundred eighty thousand, five hundred forty".