25761985 has 4 divisors (see below), whose sum is σ = 30914388. Its totient is φ = 20609584.

The previous prime is 25761977. The next prime is 25762007. The reversal of 25761985 is 58916752.

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 12446784 + 13315201 = 3528^2 + 3649^2 .

It is a cyclic number.

It is not a de Polignac number, because 25761985 - 2³ = 25761977 is a prime.

It is a super-2 number, since 2×25761985² = 1327359742280450, which contains 22 as substring.

It is a Duffinian 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, 2576194 + ... + 2576203.

It is an arithmetic number, because the mean of its divisors is an integer number (7728597).

Almost surely, 2^25761985 is an apocalyptic number.

It is an amenable number.

25761985 is a deficient number, since it is larger than the sum of its proper divisors (5152403).

25761985 is an equidigital number, since it uses as much as digits as its factorization.

25761985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5152402.

The product of its digits is 151200, while the sum is 43.

The square root of 25761985 is about 5075.6265623074. The cubic root of 25761985 is about 295.3428361192.

The spelling of 25761985 in words is "twenty-five million, seven hundred sixty-one thousand, nine hundred eighty-five".