278828885 has 8 divisors (see below), whose sum is σ = 349142400. Its totient is φ = 213364624.

The previous prime is 278828873. The next prime is 278828887. The reversal of 278828885 is 588828872.

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

It is a cyclic number.

It is not a de Polignac number, because 278828885 - 2⁶ = 278828821 is a prime.

It is a super-2 number, since 2×278828885² = 155491094220686450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 278828885.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278828887) 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, 1212185 + ... + 1212414.

It is an arithmetic number, because the mean of its divisors is an integer number (43642800).

Almost surely, 2^278828885 is an apocalyptic number.

It is an amenable number.

278828885 is a deficient number, since it is larger than the sum of its proper divisors (70313515).

278828885 is a wasteful number, since it uses less digits than its factorization.

278828885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2424627.

The product of its digits is 4587520, while the sum is 56.

The square root of 278828885 is about 16698.1701093264. The cubic root of 278828885 is about 653.2998934421.

The spelling of 278828885 in words is "two hundred seventy-eight million, eight hundred twenty-eight thousand, eight hundred eighty-five".