228740 has 12 divisors (see below), whose sum is σ = 480396. Its totient is φ = 91488.

The previous prime is 228737. The next prime is 228751. The reversal of 228740 is 47822.

It can be written as a sum of positive squares in 2 ways, for example, as 75076 + 153664 = 274^2 + 392^2 .

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5699 + ... + 5738.

It is an arithmetic number, because the mean of its divisors is an integer number (40033).

2²²⁸⁷⁴⁰ is an apocalyptic number.

228740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228740 is an abundant number, since it is smaller than the sum of its proper divisors (251656).

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

228740 is a wasteful number, since it uses less digits than its factorization.

228740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11446 (or 11444 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 228740 is about 478.2677074610. The cubic root of 228740 is about 61.1571688295.

The spelling of 228740 in words is "two hundred twenty-eight thousand, seven hundred forty".