278474428 has 12 divisors (see below), whose sum is σ = 487463760. Its totient is φ = 139199072.

The previous prime is 278474423. The next prime is 278474527. The reversal of 278474428 is 824474872.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278474423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12600 + ... + 26752.

It is an arithmetic number, because the mean of its divisors is an integer number (40621980).

Almost surely, 2^278474428 is an apocalyptic number.

It is an amenable number.

278474428 is a deficient number, since it is larger than the sum of its proper divisors (208989332).

278474428 is a wasteful number, since it uses less digits than its factorization.

278474428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19076 (or 19074 counting only the distinct ones).

The product of its digits is 802816, while the sum is 46.

The square root of 278474428 is about 16687.5530860579. The cubic root of 278474428 is about 653.0229435188.

The spelling of 278474428 in words is "two hundred seventy-eight million, four hundred seventy-four thousand, four hundred twenty-eight".