228815993 has 8 divisors (see below), whose sum is σ = 275267520. Its totient is φ = 185805360.

The previous prime is 228815987. The next prime is 228816011. The reversal of 228815993 is 399518822.

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 228815993 - 2⁸ = 228815737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228815933) 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, 860078 + ... + 860343.

It is an arithmetic number, because the mean of its divisors is an integer number (34408440).

Almost surely, 2^228815993 is an apocalyptic number.

It is an amenable number.

228815993 is a deficient number, since it is larger than the sum of its proper divisors (46451527).

228815993 is a wasteful number, since it uses less digits than its factorization.

228815993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1720447.

The product of its digits is 311040, while the sum is 47.

The square root of 228815993 is about 15126.6649662112. The cubic root of 228815993 is about 611.6394071341.

It can be divided in two parts, 2288 and 15993, that added together give a palindrome (18281).

The spelling of 228815993 in words is "two hundred twenty-eight million, eight hundred fifteen thousand, nine hundred ninety-three".