278494578 has 32 divisors (see below), whose sum is σ = 655283520. Its totient is φ = 87370560.

The previous prime is 278494549. The next prime is 278494583. The reversal of 278494578 is 875494872.

It is a happy number.

278494578 is a `hidden beast` number, since 27 + 8 + 49 + 4 + 578 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 150768 + ... + 152603.

It is an arithmetic number, because the mean of its divisors is an integer number (20477610).

Almost surely, 2^278494578 is an apocalyptic number.

278494578 is an abundant number, since it is smaller than the sum of its proper divisors (376788942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

278494578 is a wasteful number, since it uses less digits than its factorization.

278494578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303399 (or 303393 counting only the distinct ones).

The product of its digits is 4515840, while the sum is 54.

The square root of 278494578 is about 16688.1568185345. The cubic root of 278494578 is about 653.0386937322.

The spelling of 278494578 in words is "two hundred seventy-eight million, four hundred ninety-four thousand, five hundred seventy-eight".