25665630 has 16 divisors (see below), whose sum is σ = 61597584. Its totient is φ = 6844160.

The previous prime is 25665617. The next prime is 25665641. The reversal of 25665630 is 3656652.

It is a junction number, because it is equal to n+sod(n) for n = 25665591 and 25665600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 427731 + ... + 427790.

It is an arithmetic number, because the mean of its divisors is an integer number (3849849).

Almost surely, 2^25665630 is an apocalyptic number.

25665630 is an abundant number, since it is smaller than the sum of its proper divisors (35931954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25665630 is a wasteful number, since it uses less digits than its factorization.

25665630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855531.

The product of its (nonzero) digits is 32400, while the sum is 33.

The square root of 25665630 is about 5066.1257386686. The cubic root of 25665630 is about 294.9741622492.

It can be divided in two parts, 256656 and 30, that added together give a triangular number (256686 = T₇₁₆).

The spelling of 25665630 in words is "twenty-five million, six hundred sixty-five thousand, six hundred thirty".