25777985 has 8 divisors (see below), whose sum is σ = 31458240. Its totient is φ = 20272624.

The previous prime is 25777943. The next prime is 25777993. The reversal of 25777985 is 58977752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25777985 is a prime.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 43397 + ... + 43986.

It is an arithmetic number, because the mean of its divisors is an integer number (3932280).

Almost surely, 2^25777985 is an apocalyptic number.

It is an amenable number.

25777985 is a deficient number, since it is larger than the sum of its proper divisors (5680255).

25777985 is an equidigital number, since it uses as much as digits as its factorization.

25777985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87447.

The product of its digits is 1234800, while the sum is 50.

The square root of 25777985 is about 5077.2024777430. The cubic root of 25777985 is about 295.4039663391.

It can be divided in two parts, 25777 and 985, that added together give a palindrome (26762).

The spelling of 25777985 in words is "twenty-five million, seven hundred seventy-seven thousand, nine hundred eighty-five".