25280660 has 12 divisors (see below), whose sum is σ = 53089428. Its totient is φ = 10112256.

The previous prime is 25280653. The next prime is 25280669. The reversal of 25280660 is 6608252.

It can be written as a sum of positive squares in 2 ways, for example, as 5317636 + 19963024 = 2306^2 + 4468^2 .

It is a super-2 number, since 2×25280660² = 1278223540071200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25280669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 631997 + ... + 632036.

It is an arithmetic number, because the mean of its divisors is an integer number (4424119).

Almost surely, 2^25280660 is an apocalyptic number.

25280660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25280660 is an abundant number, since it is smaller than the sum of its proper divisors (27808768).

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

25280660 is a wasteful number, since it uses less digits than its factorization.

25280660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1264042 (or 1264040 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 25280660 is about 5027.9876690382. The cubic root of 25280660 is about 293.4919109279.

The spelling of 25280660 in words is "twenty-five million, two hundred eighty thousand, six hundred sixty".