25756013 has 4 divisors (see below), whose sum is σ = 25774368. Its totient is φ = 25737660.

The previous prime is 25755997. The next prime is 25756019. The reversal of 25756013 is 31065752.

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 25756013 - 2⁴ = 25755997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25756019) 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, 6881 + ... + 9942.

It is an arithmetic number, because the mean of its divisors is an integer number (6443592).

Almost surely, 2^25756013 is an apocalyptic number.

It is an amenable number.

25756013 is a deficient number, since it is larger than the sum of its proper divisors (18355).

25756013 is a wasteful number, since it uses less digits than its factorization.

25756013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18354.

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 25756013 is about 5075.0382264570. The cubic root of 25756013 is about 295.3200127779.

The spelling of 25756013 in words is "twenty-five million, seven hundred fifty-six thousand, thirteen".