278730 has 48 divisors (see below), whose sum is σ = 767520. Its totient is φ = 69984.

The previous prime is 278717. The next prime is 278741. The reversal of 278730 is 37872.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 278694 and 278703.

It is a congruent number.

It is an unprimeable number.

278730 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1629 + ... + 1791.

It is an arithmetic number, because the mean of its divisors is an integer number (15990).

2²⁷⁸⁷³⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 278730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (383760).

278730 is an abundant number, since it is smaller than the sum of its proper divisors (488790).

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

278730 is a wasteful number, since it uses less digits than its factorization.

278730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195 (or 192 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 278730 is about 527.9488611599. The cubic root of 278730 is about 65.3222654675.

The spelling of 278730 in words is "two hundred seventy-eight thousand, seven hundred thirty".