25263621 has 12 divisors (see below), whose sum is σ = 36992748. Its totient is φ = 16611264.

The previous prime is 25263619. The next prime is 25263643. The reversal of 25263621 is 12636252.

25263621 is a `hidden beast` number, since 2 + 5 + 2 + 636 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 13771521 + 11492100 = 3711^2 + 3390^2 .

It is not a de Polignac number, because 25263621 - 2¹ = 25263619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25263671) 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, 18570 + ... + 19883.

It is an arithmetic number, because the mean of its divisors is an integer number (3082729).

Almost surely, 2^25263621 is an apocalyptic number.

It is an amenable number.

25263621 is a deficient number, since it is larger than the sum of its proper divisors (11729127).

25263621 is a wasteful number, since it uses less digits than its factorization.

25263621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38532 (or 38529 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 25263621 is about 5026.2929679835. The cubic root of 25263621 is about 293.4259588972.

Adding to 25263621 its reverse (12636252), we get a palindrome (37899873).

The spelling of 25263621 in words is "twenty-five million, two hundred sixty-three thousand, six hundred twenty-one".