228033491 has 8 divisors (see below), whose sum is σ = 260703840. Its totient is φ = 195386688.

The previous prime is 228033473. The next prime is 228033493. The reversal of 228033491 is 194330822.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-228033491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228033493) 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, 27545 + ... + 34853.

It is an arithmetic number, because the mean of its divisors is an integer number (32587980).

Almost surely, 2^228033491 is an apocalyptic number.

228033491 is a deficient number, since it is larger than the sum of its proper divisors (32670349).

228033491 is an equidigital number, since it uses as much as digits as its factorization.

228033491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11773.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 228033491 is about 15100.7778276485. Note that the first 3 decimals coincide. The cubic root of 228033491 is about 610.9413852981.

The spelling of 228033491 in words is "two hundred twenty-eight million, thirty-three thousand, four hundred ninety-one".