278661315 has 24 divisors (see below), whose sum is σ = 470568528. Its totient is φ = 140794560.

The previous prime is 278661283. The next prime is 278661329. The reversal of 278661315 is 513166872.

It is not a de Polignac number, because 278661315 - 2⁵ = 278661283 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20316 + ... + 31145.

It is an arithmetic number, because the mean of its divisors is an integer number (19607022).

Almost surely, 2^278661315 is an apocalyptic number.

278661315 is a deficient number, since it is larger than the sum of its proper divisors (191907213).

278661315 is a wasteful number, since it uses less digits than its factorization.

278661315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51507 (or 51488 counting only the distinct ones).

The product of its digits is 60480, while the sum is 39.

The square root of 278661315 is about 16693.1517395607. The cubic root of 278661315 is about 653.1689942817.

The spelling of 278661315 in words is "two hundred seventy-eight million, six hundred sixty-one thousand, three hundred fifteen".