228690 has 96 divisors (see below), whose sum is σ = 766080. Its totient is φ = 47520.

The previous prime is 228677. The next prime is 228707. The reversal of 228690 is 96822.

It is a super-2 number, since 2×228690² = 104598232200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20785 + ... + 20795.

It is an arithmetic number, because the mean of its divisors is an integer number (7980).

2²²⁸⁶⁹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 228690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (383040).

228690 is an abundant number, since it is smaller than the sum of its proper divisors (537390).

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

228690 is a wasteful number, since it uses less digits than its factorization.

228690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45 (or 28 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 228690 is about 478.2154326243. The cubic root of 228690 is about 61.1527124143.

The spelling of 228690 in words is "two hundred twenty-eight thousand, six hundred ninety".