25007540 has 24 divisors (see below), whose sum is σ = 53798472. Its totient is φ = 9758720.

The previous prime is 25007533. The next prime is 25007551. The reversal of 25007540 is 4570052.

It can be written as a sum of positive squares in 4 ways, for example, as 781456 + 24226084 = 884^2 + 4922^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14429 + ... + 16068.

It is an arithmetic number, because the mean of its divisors is an integer number (2241603).

Almost surely, 2^25007540 is an apocalyptic number.

25007540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25007540 is an abundant number, since it is smaller than the sum of its proper divisors (28790932).

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

25007540 is a wasteful number, since it uses less digits than its factorization.

25007540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30547 (or 30545 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 23.

The square root of 25007540 is about 5000.7539431570. The cubic root of 25007540 is about 292.4311669915.

Adding to 25007540 its reverse (4570052), we get a palindrome (29577592).

The spelling of 25007540 in words is "twenty-five million, seven thousand, five hundred forty".