278228012 has 24 divisors (see below), whose sum is σ = 503097504. Its totient is φ = 134531712.

The previous prime is 278228003. The next prime is 278228023. The reversal of 278228012 is 210822872.

It is a super-2 number, since 2×278228012² = 154821653322944288, 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 278228012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19088 + ... + 30344.

It is an arithmetic number, because the mean of its divisors is an integer number (20962396).

Almost surely, 2^278228012 is an apocalyptic number.

It is an amenable number.

278228012 is a deficient number, since it is larger than the sum of its proper divisors (224869492).

278228012 is a wasteful number, since it uses less digits than its factorization.

278228012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11465 (or 11463 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 278228012 is about 16680.1682245714. The cubic root of 278228012 is about 652.8302713830.

The spelling of 278228012 in words is "two hundred seventy-eight million, two hundred twenty-eight thousand, twelve".