278872641 has 24 divisors (see below), whose sum is σ = 427714560. Its totient is φ = 174485376.

The previous prime is 278872639. The next prime is 278872661. The reversal of 278872641 is 146278872.

It is not a de Polignac number, because 278872641 - 2¹ = 278872639 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (278872661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56220 + ... + 60978.

It is an arithmetic number, because the mean of its divisors is an integer number (17821440).

Almost surely, 2^278872641 is an apocalyptic number.

It is an amenable number.

278872641 is a deficient number, since it is larger than the sum of its proper divisors (148841919).

278872641 is a wasteful number, since it uses less digits than its factorization.

278872641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5165 (or 5162 counting only the distinct ones).

The product of its digits is 301056, while the sum is 45.

The square root of 278872641 is about 16699.4802613734. The cubic root of 278872641 is about 653.3340652903.

The spelling of 278872641 in words is "two hundred seventy-eight million, eight hundred seventy-two thousand, six hundred forty-one".