228639760 has 40 divisors (see below), whose sum is σ = 536869656. Its totient is φ = 90547200.

The previous prime is 228639731. The next prime is 228639769. The reversal of 228639760 is 67936822.

It can be written as a sum of positive squares in 4 ways, for example, as 31181056 + 197458704 = 5584^2 + 14052^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×228639760² = 104552279705715200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (228639769) 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, 6069 + ... + 22228.

Almost surely, 2^228639760 is an apocalyptic number.

228639760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228639760 is an abundant number, since it is smaller than the sum of its proper divisors (308229896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

228639760 is a wasteful number, since it uses less digits than its factorization.

228639760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28411 (or 28405 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 228639760 is about 15120.8386010829. The cubic root of 228639760 is about 611.4823395395.

It can be divided in two parts, 22863 and 9760, that added together give a palindrome (32623).

The spelling of 228639760 in words is "two hundred twenty-eight million, six hundred thirty-nine thousand, seven hundred sixty".