25781036 has 6 divisors (see below), whose sum is σ = 45116820. Its totient is φ = 12890516.

The previous prime is 25781033. The next prime is 25781069. The reversal of 25781036 is 63018752.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 25780993 and 25781011.

It is not an unprimeable number, because it can be changed into a prime (25781033) by changing a digit.

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 as a sum of consecutive naturals, namely, 3222626 + ... + 3222633.

It is an arithmetic number, because the mean of its divisors is an integer number (7519470).

Almost surely, 2^25781036 is an apocalyptic number.

It is an amenable number.

25781036 is a deficient number, since it is larger than the sum of its proper divisors (19335784).

25781036 is a wasteful number, since it uses less digits than its factorization.

25781036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6445263 (or 6445261 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 25781036 is about 5077.5029295905. The cubic root of 25781036 is about 295.4156202361.

Adding to 25781036 its reverse (63018752), we get a palindrome (88799788).

The spelling of 25781036 in words is "twenty-five million, seven hundred eighty-one thousand, thirty-six".