278856013 has 8 divisors (see below), whose sum is σ = 289846368. Its totient is φ = 268047504.

The previous prime is 278855987. The next prime is 278856037. The reversal of 278856013 is 310658872.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 278856013 - 2⁹ = 278855501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278856043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42331 + ... + 48472.

It is an arithmetic number, because the mean of its divisors is an integer number (36230796).

Almost surely, 2^278856013 is an apocalyptic number.

It is an amenable number.

278856013 is a deficient number, since it is larger than the sum of its proper divisors (10990355).

278856013 is an equidigital number, since it uses as much as digits as its factorization.

278856013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90923.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 278856013 is about 16698.9823941461. The cubic root of 278856013 is about 653.3210798468.

The spelling of 278856013 in words is "two hundred seventy-eight million, eight hundred fifty-six thousand, thirteen".