278584061 has 18 divisors (see below), whose sum is σ = 342042750. Its totient is φ = 226204272.

The previous prime is 278584051. The next prime is 278584069. The reversal of 278584061 is 160485872.

It can be written as a sum of positive squares in only one way, i.e., 159643225 + 118940836 = 12635^2 + 10906^2 .

It is not a de Polignac number, because 278584061 - 2¹⁰ = 278583037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278584069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9815 + ... + 25563.

It is an arithmetic number, because the mean of its divisors is an integer number (19002375).

Almost surely, 2^278584061 is an apocalyptic number.

It is an amenable number.

278584061 is a deficient number, since it is larger than the sum of its proper divisors (63458689).

278584061 is a wasteful number, since it uses less digits than its factorization.

278584061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15801 (or 15775 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 41.

The square root of 278584061 is about 16690.8376362602. The cubic root of 278584061 is about 653.1086287907.

The spelling of 278584061 in words is "two hundred seventy-eight million, five hundred eighty-four thousand, sixty-one".