25630813 has 4 divisors (see below), whose sum is σ = 27602428. Its totient is φ = 23659200.

The previous prime is 25630807. The next prime is 25630823. The reversal of 25630813 is 31803652.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15657849 + 9972964 = 3957^2 + 3158^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25630813 is a prime.

It is a super-3 number, since 3×25630813³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25630823) 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, 985788 + ... + 985813.

It is an arithmetic number, because the mean of its divisors is an integer number (6900607).

Almost surely, 2^25630813 is an apocalyptic number.

It is an amenable number.

25630813 is a deficient number, since it is larger than the sum of its proper divisors (1971615).

25630813 is a wasteful number, since it uses less digits than its factorization.

25630813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1971614.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 25630813 is about 5062.6883174851. The cubic root of 25630813 is about 294.8407183799.

The spelling of 25630813 in words is "twenty-five million, six hundred thirty thousand, eight hundred thirteen".