228642409 has 8 divisors (see below), whose sum is σ = 248976000. Its totient is φ = 209138832.

The previous prime is 228642389. The next prime is 228642419. The reversal of 228642409 is 904246822.

228642409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 228642409 - 2²³ = 220253801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (228642419) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206929 + ... + 208030.

It is an arithmetic number, because the mean of its divisors is an integer number (31122000).

Almost surely, 2^228642409 is an apocalyptic number.

228642409 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

228642409 is a deficient number, since it is larger than the sum of its proper divisors (20333591).

228642409 is a wasteful number, since it uses less digits than its factorization.

228642409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415007.

The product of its (nonzero) digits is 55296, while the sum is 37.

The square root of 228642409 is about 15120.9261951773. The cubic root of 228642409 is about 611.4847010571.

The spelling of 228642409 in words is "two hundred twenty-eight million, six hundred forty-two thousand, four hundred nine".