25742761 has 4 divisors (see below), whose sum is σ = 28083024. Its totient is φ = 23402500.

The previous prime is 25742737. The next prime is 25742771. The reversal of 25742761 is 16724752.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 25742761 - 2⁵ = 25742729 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (25742771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1170115 + ... + 1170136.

It is an arithmetic number, because the mean of its divisors is an integer number (7020756).

Almost surely, 2^25742761 is an apocalyptic number.

It is an amenable number.

25742761 is a deficient number, since it is larger than the sum of its proper divisors (2340263).

25742761 is a wasteful number, since it uses less digits than its factorization.

25742761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2340262.

The product of its digits is 23520, while the sum is 34.

The square root of 25742761 is about 5073.7324525442. The cubic root of 25742761 is about 295.2693546758.

Subtracting from 25742761 its reverse (16724752), we obtain a square (9018009 = 3003²).

It can be divided in two parts, 2574 and 2761, that added together give a palindrome (5335).

The spelling of 25742761 in words is "twenty-five million, seven hundred forty-two thousand, seven hundred sixty-one".