25687025 has 36 divisors (see below), whose sum is σ = 39927132. Its totient is φ = 16248960.

The previous prime is 25687009. The next prime is 25687073. The reversal of 25687025 is 52078652.

It can be written as a sum of positive squares in 6 ways, for example, as 1882384 + 23804641 = 1372^2 + 4879^2 .

It is not a de Polignac number, because 25687025 - 2⁴ = 25687009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 15119 + ... + 16731.

It is an arithmetic number, because the mean of its divisors is an integer number (1109087).

Almost surely, 2^25687025 is an apocalyptic number.

25687025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25687025 is a deficient number, since it is larger than the sum of its proper divisors (14240107).

25687025 is a wasteful number, since it uses less digits than its factorization.

25687025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1650 (or 1638 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 35.

The square root of 25687025 is about 5068.2368729174. The cubic root of 25687025 is about 295.0561034729.

It can be divided in two parts, 256 and 87025, that multiplied together give a square (22278400 = 4720²).

The spelling of 25687025 in words is "twenty-five million, six hundred eighty-seven thousand, twenty-five".