25587261 has 36 divisors (see below), whose sum is σ = 45535932. Its totient is φ = 13757184.

The previous prime is 25587241. The next prime is 25587271. The reversal of 25587261 is 16278552.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 22325625 + 3261636 = 4725^2 + 1806^2 .

It is not a de Polignac number, because 25587261 - 2⁶ = 25587197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25587241) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5791 + ... + 9203.

It is an arithmetic number, because the mean of its divisors is an integer number (1264887).

Almost surely, 2^25587261 is an apocalyptic number.

25587261 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25587261 is a deficient number, since it is larger than the sum of its proper divisors (19948671).

25587261 is a wasteful number, since it uses less digits than its factorization.

25587261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3450 (or 3440 counting only the distinct ones).

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

The square root of 25587261 is about 5058.3852166477. The cubic root of 25587261 is about 294.6736254496.

The spelling of 25587261 in words is "twenty-five million, five hundred eighty-seven thousand, two hundred sixty-one".