25815725 has 12 divisors (see below), whose sum is σ = 34474356. Its totient is φ = 19063680.

The previous prime is 25815721. The next prime is 25815733. The reversal of 25815725 is 52751852.

It can be written as a sum of positive squares in 6 ways, for example, as 434281 + 25381444 = 659^2 + 5038^2 .

It is not a de Polignac number, because 25815725 - 2² = 25815721 is a prime.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25815721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39392 + ... + 40041.

It is an arithmetic number, because the mean of its divisors is an integer number (2872863).

Almost surely, 2^25815725 is an apocalyptic number.

25815725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25815725 is a deficient number, since it is larger than the sum of its proper divisors (8658631).

25815725 is a wasteful number, since it uses less digits than its factorization.

25815725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79456 (or 79451 counting only the distinct ones).

The product of its digits is 28000, while the sum is 35.

The square root of 25815725 is about 5080.9177320638. The cubic root of 25815725 is about 295.5480571136.

The spelling of 25815725 in words is "twenty-five million, eight hundred fifteen thousand, seven hundred twenty-five".