25278913 has 8 divisors (see below), whose sum is σ = 27613440. Its totient is φ = 22950480.

The previous prime is 25278907. The next prime is 25278931. The reversal of 25278913 is 31987252.

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 25278913 - 2¹⁷ = 25147841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25278943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15031 + ... + 16627.

It is an arithmetic number, because the mean of its divisors is an integer number (3451680).

Almost surely, 2^25278913 is an apocalyptic number.

It is an amenable number.

25278913 is a deficient number, since it is larger than the sum of its proper divisors (2334527).

25278913 is a wasteful number, since it uses less digits than its factorization.

25278913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3047.

The product of its digits is 30240, while the sum is 37.

The square root of 25278913 is about 5027.8139384826. The cubic root of 25278913 is about 293.4851502634.

The spelling of 25278913 in words is "twenty-five million, two hundred seventy-eight thousand, nine hundred thirteen".