25781012 has 12 divisors (see below), whose sum is σ = 45370080. Its totient is φ = 12818136.

The previous prime is 25781011. The next prime is 25781033. The reversal of 25781012 is 21018752.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25781011) 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, 17288 + ... + 18719.

It is an arithmetic number, because the mean of its divisors is an integer number (3780840).

Almost surely, 2^25781012 is an apocalyptic number.

It is an amenable number.

25781012 is a deficient number, since it is larger than the sum of its proper divisors (19589068).

25781012 is a wasteful number, since it uses less digits than its factorization.

25781012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36190 (or 36188 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 25781012 is about 5077.5005662235. The cubic root of 25781012 is about 295.4155285670.

Adding to 25781012 its reverse (21018752), we get a palindrome (46799764).

The spelling of 25781012 in words is "twenty-five million, seven hundred eighty-one thousand, twelve".