25278965 has 4 divisors (see below), whose sum is σ = 30334764. Its totient is φ = 20223168.

The previous prime is 25278943. The next prime is 25278977. The reversal of 25278965 is 56987252.

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 17247409 + 8031556 = 4153^2 + 2834^2 .

It is a cyclic number.

It is not a de Polignac number, because 25278965 - 2⁶ = 25278901 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2527892 + ... + 2527901.

It is an arithmetic number, because the mean of its divisors is an integer number (7583691).

Almost surely, 2^25278965 is an apocalyptic number.

It is an amenable number.

25278965 is a deficient number, since it is larger than the sum of its proper divisors (5055799).

25278965 is an equidigital number, since it uses as much as digits as its factorization.

25278965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5055798.

The product of its digits is 302400, while the sum is 44.

The square root of 25278965 is about 5027.8191097135. The cubic root of 25278965 is about 293.4853515012.

The spelling of 25278965 in words is "twenty-five million, two hundred seventy-eight thousand, nine hundred sixty-five".