25278425 has 6 divisors (see below), whose sum is σ = 31345278. Its totient is φ = 20222720.

The previous prime is 25278389. The next prime is 25278431. The reversal of 25278425 is 52487252.

It can be written as a sum of positive squares in 3 ways, for example, as 2886601 + 22391824 = 1699^2 + 4732^2 .

It is not a de Polignac number, because 25278425 - 2¹² = 25274329 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 505544 + ... + 505593.

It is an arithmetic number, because the mean of its divisors is an integer number (5224213).

Almost surely, 2^25278425 is an apocalyptic number.

25278425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25278425 is a deficient number, since it is larger than the sum of its proper divisors (6066853).

25278425 is a wasteful number, since it uses less digits than its factorization.

25278425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011147 (or 1011142 counting only the distinct ones).

The product of its digits is 44800, while the sum is 35.

The square root of 25278425 is about 5027.7654082107. The cubic root of 25278425 is about 293.4832617108.

The spelling of 25278425 in words is "twenty-five million, two hundred seventy-eight thousand, four hundred twenty-five".