23278225 has 6 divisors (see below), whose sum is σ = 28865030. Its totient is φ = 18622560.

The previous prime is 23278223. The next prime is 23278243. The reversal of 23278225 is 52287232.

It can be written as a sum of positive squares in 3 ways, for example, as 199809 + 23078416 = 447^2 + 4804^2 .

It is not a de Polignac number, because 23278225 - 2¹ = 23278223 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23278223) 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 5 ways as a sum of consecutive naturals, for example, 465540 + ... + 465589.

Almost surely, 2^23278225 is an apocalyptic number.

23278225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

23278225 is a deficient number, since it is larger than the sum of its proper divisors (5586805).

23278225 is an equidigital number, since it uses as much as digits as its factorization.

23278225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931139 (or 931134 counting only the distinct ones).

The product of its digits is 13440, while the sum is 31.

The square root of 23278225 is about 4824.7512889267. The cubic root of 23278225 is about 285.5288221971.

The spelling of 23278225 in words is "twenty-three million, two hundred seventy-eight thousand, two hundred twenty-five".