25780913 has 4 divisors (see below), whose sum is σ = 26669940. Its totient is φ = 24891888.

The previous prime is 25780889. The next prime is 25780919. The reversal of 25780913 is 31908752.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19465744 + 6315169 = 4412^2 + 2513^2 .

It is a cyclic number.

It is not a de Polignac number, because 25780913 - 2⁶ = 25780849 is a prime.

It is a super-2 number, since 2×25780913² = 1329310950227138, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25780919) 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, 444470 + ... + 444527.

It is an arithmetic number, because the mean of its divisors is an integer number (6667485).

Almost surely, 2^25780913 is an apocalyptic number.

It is an amenable number.

25780913 is a deficient number, since it is larger than the sum of its proper divisors (889027).

25780913 is an equidigital number, since it uses as much as digits as its factorization.

25780913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889026.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 25780913 is about 5077.4908173231. The cubic root of 25780913 is about 295.4151504311.

The spelling of 25780913 in words is "twenty-five million, seven hundred eighty thousand, nine hundred thirteen".