25768781 has 16 divisors (see below), whose sum is σ = 27563520. Its totient is φ = 24053760.

The previous prime is 25768751. The next prime is 25768783. The reversal of 25768781 is 18786752.

It is a cyclic number.

It is not a de Polignac number, because 25768781 - 2²² = 21574477 is a prime.

It is a super-3 number, since 3×25768781³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25768783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133421 + ... + 133613.

It is an arithmetic number, because the mean of its divisors is an integer number (1722720).

Almost surely, 2^25768781 is an apocalyptic number.

It is an amenable number.

25768781 is a deficient number, since it is larger than the sum of its proper divisors (1794739).

25768781 is a wasteful number, since it uses less digits than its factorization.

25768781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356.

The product of its digits is 188160, while the sum is 44.

The square root of 25768781 is about 5076.2959921581. The cubic root of 25768781 is about 295.3688042714.

The spelling of 25768781 in words is "twenty-five million, seven hundred sixty-eight thousand, seven hundred eighty-one".