25678997 has 4 divisors (see below), whose sum is σ = 26305356. Its totient is φ = 25052640.

The previous prime is 25678981. The next prime is 25679011. The reversal of 25678997 is 79987652.

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

It can be written as a sum of positive squares in 2 ways, for example, as 988036 + 24690961 = 994^2 + 4969^2 .

It is not a de Polignac number, because 25678997 - 2⁴ = 25678981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25678297) by changing a digit.

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, 313118 + ... + 313199.

It is an arithmetic number, because the mean of its divisors is an integer number (6576339).

Almost surely, 2^25678997 is an apocalyptic number.

It is an amenable number.

25678997 is a deficient number, since it is larger than the sum of its proper divisors (626359).

25678997 is an equidigital number, since it uses as much as digits as its factorization.

25678997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626358.

The product of its digits is 1905120, while the sum is 53.

The square root of 25678997 is about 5067.4448196305. Note that the first 3 decimals coincide. The cubic root of 25678997 is about 295.0253621784.

The spelling of 25678997 in words is "twenty-five million, six hundred seventy-eight thousand, nine hundred ninety-seven".