278312157 has 12 divisors (see below), whose sum is σ = 402402624. Its totient is φ = 185358600.

The previous prime is 278312147. The next prime is 278312179. The reversal of 278312157 is 751213872.

It is not a de Polignac number, because 278312157 - 2¹⁰ = 278311133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278312137) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5253 + ... + 24170.

It is an arithmetic number, because the mean of its divisors is an integer number (33533552).

Almost surely, 2^278312157 is an apocalyptic number.

It is an amenable number.

278312157 is a deficient number, since it is larger than the sum of its proper divisors (124090467).

278312157 is a wasteful number, since it uses less digits than its factorization.

278312157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30480 (or 30477 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 278312157 is about 16682.6903405896. The cubic root of 278312157 is about 652.8960769620.

The spelling of 278312157 in words is "two hundred seventy-eight million, three hundred twelve thousand, one hundred fifty-seven".