25530646 has 4 divisors (see below), whose sum is σ = 38295972. Its totient is φ = 12765322.

The previous prime is 25530611. The next prime is 25530649. The reversal of 25530646 is 64603552.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25530649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6382660 + ... + 6382663.

It is an arithmetic number, because the mean of its divisors is an integer number (9573993).

Almost surely, 2^25530646 is an apocalyptic number.

25530646 is a deficient number, since it is larger than the sum of its proper divisors (12765326).

25530646 is a wasteful number, since it uses less digits than its factorization.

25530646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12765325.

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 25530646 is about 5052.7859641984. The cubic root of 25530646 is about 294.4561309339.

The spelling of 25530646 in words is "twenty-five million, five hundred thirty thousand, six hundred forty-six".