25205490 has 24 divisors (see below), whose sum is σ = 65534508. Its totient is φ = 6721440.

The previous prime is 25205483. The next prime is 25205491. The reversal of 25205490 is 9450252.

25205490 is a `hidden beast` number, since 2 + 520 + 54 + 90 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 25190361 + 15129 = 5019^2 + 123^2 .

It is a super-2 number, since 2×25205490² = 1270633452280200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (25205491) 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 11 ways as a sum of consecutive naturals, for example, 139941 + ... + 140120.

Almost surely, 2^25205490 is an apocalyptic number.

25205490 is an abundant number, since it is smaller than the sum of its proper divisors (40329018).

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

25205490 is a wasteful number, since it uses less digits than its factorization.

25205490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280074 (or 280071 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 25205490 is about 5020.5069465145. The cubic root of 25205490 is about 293.2007306416.

The spelling of 25205490 in words is "twenty-five million, two hundred five thousand, four hundred ninety".