25278329 has 2 divisors, whose sum is σ = 25278330. Its totient is φ = 25278328.

The previous prime is 25278317. The next prime is 25278349. The reversal of 25278329 is 92387252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24730729 + 547600 = 4973^2 + 740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25278329 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 25278292 and 25278301.

It is not a weakly prime, because it can be changed into another prime (25278349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12639164 + 12639165.

It is an arithmetic number, because the mean of its divisors is an integer number (12639165).

Almost surely, 2^25278329 is an apocalyptic number.

It is an amenable number.

25278329 is a deficient number, since it is larger than the sum of its proper divisors (1).

25278329 is an equidigital number, since it uses as much as digits as its factorization.

25278329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 38.

The square root of 25278329 is about 5027.7558612168. The cubic root of 25278329 is about 293.4828901894.

The spelling of 25278329 in words is "twenty-five million, two hundred seventy-eight thousand, three hundred twenty-nine".