25605536 has 72 divisors (see below), whose sum is σ = 58820580. Its totient is φ = 10926080.

The previous prime is 25605533. The next prime is 25605539. The reversal of 25605536 is 63550652.

It is an interprime number because it is at equal distance from previous prime (25605533) and next prime (25605539).

It can be written as a sum of positive squares in 2 ways, for example, as 25603600 + 1936 = 5060^2 + 44^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (25605533) 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 in 11 ways as a sum of consecutive naturals, for example, 65630 + ... + 66018.

Almost surely, 2^25605536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25605536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29410290).

25605536 is an abundant number, since it is smaller than the sum of its proper divisors (33215044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25605536 is a wasteful number, since it uses less digits than its factorization.

25605536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438 (or 419 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 32.

The square root of 25605536 is about 5060.1913007316. The cubic root of 25605536 is about 294.7437629417.

Subtracting 25605536 from its reverse (63550652), we obtain a triangular number (37945116 = T₈₇₁₁).

The spelling of 25605536 in words is "twenty-five million, six hundred five thousand, five hundred thirty-six".