278384961 has 4 divisors (see below), whose sum is σ = 371179952. Its totient is φ = 185589972.

The previous prime is 278384947. The next prime is 278384963. The reversal of 278384961 is 169483872.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 278384961 - 2¹⁴ = 278368577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 278384961.

It is not an unprimeable number, because it can be changed into a prime (278384963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46397491 + ... + 46397496.

It is an arithmetic number, because the mean of its divisors is an integer number (92794988).

Almost surely, 2^278384961 is an apocalyptic number.

It is an amenable number.

278384961 is a deficient number, since it is larger than the sum of its proper divisors (92794991).

278384961 is an equidigital number, since it uses as much as digits as its factorization.

278384961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92794990.

The product of its digits is 580608, while the sum is 48.

The square root of 278384961 is about 16684.8722200681. The cubic root of 278384961 is about 652.9530026126.

The spelling of 278384961 in words is "two hundred seventy-eight million, three hundred eighty-four thousand, nine hundred sixty-one".