25538507 has 4 divisors (see below), whose sum is σ = 25596600. Its totient is φ = 25480416.

The previous prime is 25538501. The next prime is 25538509. The reversal of 25538507 is 70583552.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25538507 - 2¹⁰ = 25537483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25538501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28382 + ... + 29267.

It is an arithmetic number, because the mean of its divisors is an integer number (6399150).

Almost surely, 2^25538507 is an apocalyptic number.

25538507 is a deficient number, since it is larger than the sum of its proper divisors (58093).

25538507 is an equidigital number, since it uses as much as digits as its factorization.

25538507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58092.

The product of its (nonzero) digits is 42000, while the sum is 35.

The square root of 25538507 is about 5053.5637920185. The cubic root of 25538507 is about 294.4863492856.

The spelling of 25538507 in words is "twenty-five million, five hundred thirty-eight thousand, five hundred seven".