25780761 has 10 divisors (see below), whose sum is σ = 38512122. Its totient is φ = 17187120.

The previous prime is 25780709. The next prime is 25780763. The reversal of 25780761 is 16708752.

It can be written as a sum of positive squares in only one way, i.e., 23707161 + 2073600 = 4869^2 + 1440^2 .

It is not a de Polignac number, because 25780761 - 2⁶ = 25780697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25780763) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 159060 + ... + 159221.

Almost surely, 2^25780761 is an apocalyptic number.

It is an amenable number.

25780761 is a deficient number, since it is larger than the sum of its proper divisors (12731361).

25780761 is an equidigital number, since it uses as much as digits as its factorization.

25780761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318293 (or 318284 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 25780761 is about 5077.4758492779. The cubic root of 25780761 is about 295.4145698570.

It can be divided in two parts, 257 and 80761, that added together give a palindrome (81018).

The spelling of 25780761 in words is "twenty-five million, seven hundred eighty thousand, seven hundred sixty-one".