25779982 has 4 divisors (see below), whose sum is σ = 38669976. Its totient is φ = 12889990.

The previous prime is 25779977. The next prime is 25779997. The reversal of 25779982 is 28997752.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 as a sum of consecutive naturals, namely, 6444994 + ... + 6444997.

It is an arithmetic number, because the mean of its divisors is an integer number (9667494).

Almost surely, 2^25779982 is an apocalyptic number.

25779982 is a deficient number, since it is larger than the sum of its proper divisors (12889994).

25779982 is a wasteful number, since it uses less digits than its factorization.

25779982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12889993.

The product of its digits is 635040, while the sum is 49.

The square root of 25779982 is about 5077.3991373537. The cubic root of 25779982 is about 295.4115943789.

The spelling of 25779982 in words is "twenty-five million, seven hundred seventy-nine thousand, nine hundred eighty-two".