25305506 has 16 divisors (see below), whose sum is σ = 38495520. Its totient is φ = 12475200.

The previous prime is 25305481. The next prime is 25305509. The reversal of 25305506 is 60550352.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25305509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62906 + ... + 63306.

It is an arithmetic number, because the mean of its divisors is an integer number (2405970).

Almost surely, 2^25305506 is an apocalyptic number.

25305506 is a deficient number, since it is larger than the sum of its proper divisors (13190014).

25305506 is a wasteful number, since it uses less digits than its factorization.

25305506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769.

The product of its (nonzero) digits is 4500, while the sum is 26.

The square root of 25305506 is about 5030.4578320467. The cubic root of 25305506 is about 293.5880280442.

Adding to 25305506 its reverse (60550352), we get a palindrome (85855858).

It can be divided in two parts, 25305 and 506, that multiplied together give a triangular number (12804330 = T₅₀₆₀).

The spelling of 25305506 in words is "twenty-five million, three hundred five thousand, five hundred six".