25278289 has 8 divisors (see below), whose sum is σ = 26123328. Its totient is φ = 24441840.

The previous prime is 25278287. The next prime is 25278301. The reversal of 25278289 is 98287252.

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

It is a cyclic number.

It is not a de Polignac number, because 25278289 - 2¹ = 25278287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25278287) 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, 4134 + ... + 8224.

It is an arithmetic number, because the mean of its divisors is an integer number (3265416).

Almost surely, 2^25278289 is an apocalyptic number.

It is an amenable number.

25278289 is a deficient number, since it is larger than the sum of its proper divisors (845039).

25278289 is a wasteful number, since it uses less digits than its factorization.

25278289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4295.

The product of its digits is 161280, while the sum is 43.

The square root of 25278289 is about 5027.7518832973. The cubic root of 25278289 is about 293.4827353885.

It can be divided in two parts, 2527 and 8289, that added together give a square (10816 = 104²).

The spelling of 25278289 in words is "twenty-five million, two hundred seventy-eight thousand, two hundred eighty-nine".