690228 has 96 divisors (see below), whose sum is σ = 2257920. Its totient is φ = 177120.

The previous prime is 690187. The next prime is 690233. The reversal of 690228 is 822096.

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

It is a zygodrome in base 6.

It is a congruent number.

It is an unprimeable number.

690228 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8275 + ... + 8357.

It is an arithmetic number, because the mean of its divisors is an integer number (23520).

2⁶⁹⁰²²⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 690228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1128960).

690228 is an abundant number, since it is smaller than the sum of its proper divisors (1567692).

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

690228 is a wasteful number, since it uses less digits than its factorization.

690228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114 (or 106 counting only the distinct ones).

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

The square root of 690228 is about 830.7996148290. The cubic root of 690228 is about 88.3752911703.

The spelling of 690228 in words is "six hundred ninety thousand, two hundred twenty-eight".