278860839489 has 6 divisors (see below), whose sum is σ = 402798990386. Its totient is φ = 185907226320.

The previous prime is 278860839463. The next prime is 278860839503. The reversal of 278860839489 is 984938068872.

278860839489 is a `hidden beast` number, since 2 + 7 + 8 + 8 + 60 + 83 + 9 + 489 = 666.

It can be written as a sum of positive squares in only one way, i.e., 278818849089 + 41990400 = 528033^2 + 6480^2 .

It is not a de Polignac number, because 278860839489 - 2⁵ = 278860839457 is a prime.

It is a super-2 number, since 2×278860839489² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (278860839689) 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, 15492268852 + ... + 15492268869.

Almost surely, 2^278860839489 is an apocalyptic number.

It is an amenable number.

278860839489 is a deficient number, since it is larger than the sum of its proper divisors (123938150897).

278860839489 is a wasteful number, since it uses less digits than its factorization.

278860839489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30984537727 (or 30984537724 counting only the distinct ones).

The product of its (nonzero) digits is 334430208, while the sum is 72.

The spelling of 278860839489 in words is "two hundred seventy-eight billion, eight hundred sixty million, eight hundred thirty-nine thousand, four hundred eighty-nine".