25561798 has 16 divisors (see below), whose sum is σ = 38951424. Its totient is φ = 12579840.

The previous prime is 25561777. The next prime is 25561817. The reversal of 25561798 is 89716552.

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, 39558 + ... + 40198.

It is an arithmetic number, because the mean of its divisors is an integer number (2434464).

Almost surely, 2^25561798 is an apocalyptic number.

25561798 is a deficient number, since it is larger than the sum of its proper divisors (13389626).

25561798 is a wasteful number, since it uses less digits than its factorization.

25561798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927.

The product of its digits is 151200, while the sum is 43.

The square root of 25561798 is about 5055.8676802306. The cubic root of 25561798 is about 294.5758454795.

The spelling of 25561798 in words is "twenty-five million, five hundred sixty-one thousand, seven hundred ninety-eight".