228781864 has 32 divisors (see below), whose sum is σ = 437713920. Its totient is φ = 112081536.

The previous prime is 228781843. The next prime is 228781909. The reversal of 228781864 is 468187822.

It is a happy number.

It is a super-2 number, since 2×228781864² = 104682282590628992, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82972 + ... + 85684.

It is an arithmetic number, because the mean of its divisors is an integer number (13678560).

Almost surely, 2^228781864 is an apocalyptic number.

It is an amenable number.

228781864 is a deficient number, since it is larger than the sum of its proper divisors (208932056).

228781864 is a wasteful number, since it uses less digits than its factorization.

228781864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2929 (or 2925 counting only the distinct ones).

The product of its digits is 344064, while the sum is 46.

The square root of 228781864 is about 15125.5368169199. The cubic root of 228781864 is about 611.6089959742.

It can be divided in two parts, 22878 and 1864, that added together give a palindrome (24742).

The spelling of 228781864 in words is "two hundred twenty-eight million, seven hundred eighty-one thousand, eight hundred sixty-four".