25561982 has 8 divisors (see below), whose sum is σ = 40598496. Its totient is φ = 12029152.

The previous prime is 25561969. The next prime is 25561997. The reversal of 25561982 is 28916552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 375878 + ... + 375945.

It is an arithmetic number, because the mean of its divisors is an integer number (5074812).

Almost surely, 2^25561982 is an apocalyptic number.

25561982 is a deficient number, since it is larger than the sum of its proper divisors (15036514).

25561982 is a wasteful number, since it uses less digits than its factorization.

25561982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 751842.

The product of its digits is 43200, while the sum is 38.

The square root of 25561982 is about 5055.8858768766. The cubic root of 25561982 is about 294.5765522872.

The spelling of 25561982 in words is "twenty-five million, five hundred sixty-one thousand, nine hundred eighty-two".