278622 has 24 divisors (see below), whose sum is σ = 630864. Its totient is φ = 88704.

The previous prime is 278617. The next prime is 278623. The reversal of 278622 is 226872.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 278622.

It is not an unprimeable number, because it can be changed into a prime (278623) by changing a digit.

278622 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 11 ways as a sum of consecutive naturals, for example, 78 + ... + 750.

It is an arithmetic number, because the mean of its divisors is an integer number (26286).

2²⁷⁸⁶²² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 278622, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (315432).

278622 is an abundant number, since it is smaller than the sum of its proper divisors (352242).

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

278622 is a wasteful number, since it uses less digits than its factorization.

278622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704 (or 701 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 278622 is about 527.8465686163. The cubic root of 278622 is about 65.3138275334.

It can be divided in two parts, 278 and 622, that added together give a square (900 = 30²).

The spelling of 278622 in words is "two hundred seventy-eight thousand, six hundred twenty-two".