278788 has 6 divisors (see below), whose sum is σ = 487886. Its totient is φ = 139392.

The previous prime is 278767. The next prime is 278801. The reversal of 278788 is 887872.

It can be written as a sum of positive squares in only one way, i.e., 278784 + 4 = 528^2 + 2^2 .

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 278788.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34845 + ... + 34852.

2²⁷⁸⁷⁸⁸ is an apocalyptic number.

It is an amenable number.

278788 is a deficient number, since it is larger than the sum of its proper divisors (209098).

278788 is a wasteful number, since it uses less digits than its factorization.

278788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69701 (or 69699 counting only the distinct ones).

The product of its digits is 50176, while the sum is 40.

The square root of 278788 is about 528.0037878652. The cubic root of 278788 is about 65.3267960510.

The spelling of 278788 in words is "two hundred seventy-eight thousand, seven hundred eighty-eight".