778224 has 40 divisors (see below), whose sum is σ = 2079232. Its totient is φ = 250560.

The previous prime is 778223. The next prime is 778237. The reversal of 778224 is 422877.

It is a junction number, because it is equal to n+sod(n) for n = 778191 and 778200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1227 + ... + 1749.

2⁷⁷⁸²²⁴ 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 778224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1039616).

778224 is an abundant number, since it is smaller than the sum of its proper divisors (1301008).

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

778224 is a wasteful number, since it uses less digits than its factorization.

778224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565 (or 559 counting only the distinct ones).

The product of its digits is 6272, while the sum is 30.

The square root of 778224 is about 882.1700516340. The cubic root of 778224 is about 91.9817228973.

The spelling of 778224 in words is "seven hundred seventy-eight thousand, two hundred twenty-four".