25528013 has 4 divisors (see below), whose sum is σ = 29174880. Its totient is φ = 21881148.

The previous prime is 25527977. The next prime is 25528031. The reversal of 25528013 is 31082552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25528013 - 2⁶ = 25527949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25528213) 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, 1823423 + ... + 1823436.

It is an arithmetic number, because the mean of its divisors is an integer number (7293720).

Almost surely, 2^25528013 is an apocalyptic number.

It is an amenable number.

25528013 is a deficient number, since it is larger than the sum of its proper divisors (3646867).

25528013 is an equidigital number, since it uses as much as digits as its factorization.

25528013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3646866.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 25528013 is about 5052.5254081499. The cubic root of 25528013 is about 294.4460080715.

The spelling of 25528013 in words is "twenty-five million, five hundred twenty-eight thousand, thirteen".