25506612 has 18 divisors (see below), whose sum is σ = 64475138. Its totient is φ = 8502192.

The previous prime is 25506587. The next prime is 25506619. The reversal of 25506612 is 21660552.

It can be written as a sum of positive squares in only one way, i.e., 24860196 + 646416 = 4986^2 + 804^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25506619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 354223 + ... + 354294.

Almost surely, 2^25506612 is an apocalyptic number.

It is an amenable number.

25506612 is an abundant number, since it is smaller than the sum of its proper divisors (38968526).

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

25506612 is a wasteful number, since it uses less digits than its factorization.

25506612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708527 (or 708522 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 25506612 is about 5050.4071123029. The cubic root of 25506612 is about 294.3637037060.

The spelling of 25506612 in words is "twenty-five million, five hundred six thousand, six hundred twelve".