278428828 has 12 divisors (see below), whose sum is σ = 487367272. Its totient is φ = 139181040.

The previous prime is 278428819. The next prime is 278428853. The reversal of 278428828 is 828824872.

It is a super-2 number, since 2×278428828² = 155045224522907168, which contains 22 as substring.

It is a congruent 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, 28651 + ... + 37117.

Almost surely, 2^278428828 is an apocalyptic number.

It is an amenable number.

278428828 is a deficient number, since it is larger than the sum of its proper divisors (208938444).

278428828 is a wasteful number, since it uses less digits than its factorization.

278428828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16692 (or 16690 counting only the distinct ones).

The product of its digits is 917504, while the sum is 49.

The square root of 278428828 is about 16686.1867423327. The cubic root of 278428828 is about 652.9872975507.

The spelling of 278428828 in words is "two hundred seventy-eight million, four hundred twenty-eight thousand, eight hundred twenty-eight".