25781625 has 32 divisors (see below), whose sum is σ = 47673600. Its totient is φ = 13748400.

The previous prime is 25781617. The next prime is 25781633. The reversal of 25781625 is 52618752.

It is a happy number.

25781625 is a `hidden beast` number, since 25 + 7 + 8 + 1 + 625 = 666.

It is an interprime number because it is at equal distance from previous prime (25781617) and next prime (25781633).

It is not a de Polignac number, because 25781625 - 2³ = 25781617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25781625.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 445 + ... + 7194.

It is an arithmetic number, because the mean of its divisors is an integer number (1489800).

Almost surely, 2^25781625 is an apocalyptic number.

25781625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25781625 is a deficient number, since it is larger than the sum of its proper divisors (21891975).

25781625 is an equidigital number, since it uses as much as digits as its factorization.

25781625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7663 (or 7647 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 25781625 is about 5077.5609302105. The cubic root of 25781625 is about 295.4178699321.

The spelling of 25781625 in words is "twenty-five million, seven hundred eighty-one thousand, six hundred twenty-five".