25728226 has 8 divisors (see below), whose sum is σ = 38621520. Its totient is φ = 12854388.

The previous prime is 25728221. The next prime is 25728229. The reversal of 25728226 is 62282752.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×25728226² = 1323883226214152, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25728191 and 25728200.

It is not an unprimeable number, because it can be changed into a prime (25728221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 916 + ... + 7231.

It is an arithmetic number, because the mean of its divisors is an integer number (4827690).

Almost surely, 2^25728226 is an apocalyptic number.

25728226 is a deficient number, since it is larger than the sum of its proper divisors (12893294).

25728226 is a wasteful number, since it uses less digits than its factorization.

25728226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9728.

The product of its digits is 26880, while the sum is 34.

The square root of 25728226 is about 5072.2998728388. The cubic root of 25728226 is about 295.2137720849.

The spelling of 25728226 in words is "twenty-five million, seven hundred twenty-eight thousand, two hundred twenty-six".