780228 has 18 divisors (see below), whose sum is σ = 1972334. Its totient is φ = 260064.

The previous prime is 780223. The next prime is 780233. The reversal of 780228 is 822087.

It is an interprime number because it is at equal distance from previous prime (780223) and next prime (780233).

It can be written as a sum of positive squares in only one way, i.e., 777924 + 2304 = 882^2 + 48^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (780223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10801 + ... + 10872.

2⁷⁸⁰²²⁸ is an apocalyptic number.

It is an amenable number.

780228 is an abundant number, since it is smaller than the sum of its proper divisors (1192106).

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

780228 is a wasteful number, since it uses less digits than its factorization.

780228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21683 (or 21678 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 780228 is about 883.3051567833. The cubic root of 780228 is about 92.0606090856.

The spelling of 780228 in words is "seven hundred eighty thousand, two hundred twenty-eight".