228791213 has 8 divisors (see below), whose sum is σ = 263790528. Its totient is φ = 194370624.

The previous prime is 228791209. The next prime is 228791221. The reversal of 228791213 is 312197822.

228791213 is nontrivially palindromic in base 16.

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

It is not a de Polignac number, because 228791213 - 2² = 228791209 is a prime.

It is a super-2 number, since 2×228791213² = 104690838292022738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228791413) 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, 143831 + ... + 145412.

It is an arithmetic number, because the mean of its divisors is an integer number (32973816).

Almost surely, 2^228791213 is an apocalyptic number.

It is an amenable number.

228791213 is a deficient number, since it is larger than the sum of its proper divisors (34999315).

228791213 is a wasteful number, since it uses less digits than its factorization.

228791213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289363.

The product of its digits is 12096, while the sum is 35.

The square root of 228791213 is about 15125.8458606453. The cubic root of 228791213 is about 611.6173268423.

The spelling of 228791213 in words is "two hundred twenty-eight million, seven hundred ninety-one thousand, two hundred thirteen".