228239820 has 36 divisors (see below), whose sum is σ = 692328000. Its totient is φ = 60863904.

The previous prime is 228239813. The next prime is 228239827. The reversal of 228239820 is 28932822.

It is an interprime number because it is at equal distance from previous prime (228239813) and next prime (228239827).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (228239827) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 633820 + ... + 634179.

Almost surely, 2^228239820 is an apocalyptic number.

228239820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228239820 is an abundant number, since it is smaller than the sum of its proper divisors (464088180).

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

228239820 is a wasteful number, since it uses less digits than its factorization.

228239820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1268014 (or 1268009 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 228239820 is about 15107.6080171548. The cubic root of 228239820 is about 611.1255935105.

The spelling of 228239820 in words is "two hundred twenty-eight million, two hundred thirty-nine thousand, eight hundred twenty".