278228013 has 8 divisors (see below), whose sum is σ = 423966528. Its totient is φ = 158987424.

The previous prime is 278228003. The next prime is 278228023. The reversal of 278228013 is 310822872.

It is an interprime number because it is at equal distance from previous prime (278228003) and next prime (278228023).

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

It is not a de Polignac number, because 278228013 - 2⁴ = 278227997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278228003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6624456 + ... + 6624497.

It is an arithmetic number, because the mean of its divisors is an integer number (52995816).

Almost surely, 2^278228013 is an apocalyptic number.

It is an amenable number.

278228013 is a deficient number, since it is larger than the sum of its proper divisors (145738515).

278228013 is a wasteful number, since it uses less digits than its factorization.

278228013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13248963.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 278228013 is about 16680.1682545471. The cubic root of 278228013 is about 652.8302721651.

The spelling of 278228013 in words is "two hundred seventy-eight million, two hundred twenty-eight thousand, thirteen".