278920247 has 8 divisors (see below), whose sum is σ = 294544560. Its totient is φ = 263390400.

The previous prime is 278920219. The next prime is 278920259. The reversal of 278920247 is 742029872.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 278920247 - 2⁶ = 278920183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278920277) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17504 + ... + 29397.

It is an arithmetic number, because the mean of its divisors is an integer number (36818070).

Almost surely, 2^278920247 is an apocalyptic number.

278920247 is a deficient number, since it is larger than the sum of its proper divisors (15624313).

278920247 is a wasteful number, since it uses less digits than its factorization.

278920247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47233.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 278920247 is about 16700.9055742496. The cubic root of 278920247 is about 653.3712397889.

The spelling of 278920247 in words is "two hundred seventy-eight million, nine hundred twenty thousand, two hundred forty-seven".