278553428 has 6 divisors (see below), whose sum is σ = 487468506. Its totient is φ = 139276712.

The previous prime is 278553419. The next prime is 278553463. The reversal of 278553428 is 824355872.

It can be written as a sum of positive squares in only one way, i.e., 246427204 + 32126224 = 15698^2 + 5668^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34819175 + ... + 34819182.

It is an arithmetic number, because the mean of its divisors is an integer number (81244751).

Almost surely, 2^278553428 is an apocalyptic number.

It is an amenable number.

278553428 is a deficient number, since it is larger than the sum of its proper divisors (208915078).

278553428 is a wasteful number, since it uses less digits than its factorization.

278553428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69638361 (or 69638359 counting only the distinct ones).

The product of its digits is 537600, while the sum is 44.

The square root of 278553428 is about 16689.9199518751. The cubic root of 278553428 is about 653.0846893858.

The spelling of 278553428 in words is "two hundred seventy-eight million, five hundred fifty-three thousand, four hundred twenty-eight".