228321381 has 8 divisors (see below), whose sum is σ = 304498624. Its totient is φ = 152179200.

The previous prime is 228321377. The next prime is 228321409. The reversal of 228321381 is 183123822.

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

It is not a de Polignac number, because 228321381 - 2² = 228321377 is a prime.

It is a super-2 number, since 2×228321381² = 104261306043494322, 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 (228321311) 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, 18981 + ... + 28581.

It is an arithmetic number, because the mean of its divisors is an integer number (38062328).

Almost surely, 2^228321381 is an apocalyptic number.

It is an amenable number.

228321381 is a deficient number, since it is larger than the sum of its proper divisors (76177243).

228321381 is an equidigital number, since it uses as much as digits as its factorization.

228321381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17531.

The product of its digits is 4608, while the sum is 30.

The square root of 228321381 is about 15110.3071113727. The cubic root of 228321381 is about 611.1983796388.

The spelling of 228321381 in words is "two hundred twenty-eight million, three hundred twenty-one thousand, three hundred eighty-one".