278212955 has 4 divisors (see below), whose sum is σ = 333855552. Its totient is φ = 222570360.

The previous prime is 278212943. The next prime is 278212997. The reversal of 278212955 is 559212872.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 278212955 - 2⁸ = 278212699 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 27821291 + ... + 27821300.

It is an arithmetic number, because the mean of its divisors is an integer number (83463888).

Almost surely, 2^278212955 is an apocalyptic number.

278212955 is a deficient number, since it is larger than the sum of its proper divisors (55642597).

278212955 is an equidigital number, since it uses as much as digits as its factorization.

278212955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55642596.

The product of its digits is 100800, while the sum is 41.

The square root of 278212955 is about 16679.7168740959. The cubic root of 278212955 is about 652.8184946599.

The spelling of 278212955 in words is "two hundred seventy-eight million, two hundred twelve thousand, nine hundred fifty-five".