278801655 has 16 divisors (see below), whose sum is σ = 486635904. Its totient is φ = 135176480.

The previous prime is 278801647. The next prime is 278801701. The reversal of 278801655 is 556108872.

It is not a de Polignac number, because 278801655 - 2³ = 278801647 is a prime.

It is a congruent number.

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, 844689 + ... + 845018.

It is an arithmetic number, because the mean of its divisors is an integer number (30414744).

Almost surely, 2^278801655 is an apocalyptic number.

278801655 is a deficient number, since it is larger than the sum of its proper divisors (207834249).

278801655 is a wasteful number, since it uses less digits than its factorization.

278801655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1689726.

The product of its (nonzero) digits is 134400, while the sum is 42.

The square root of 278801655 is about 16697.3547306153. The cubic root of 278801655 is about 653.2786259955.

The spelling of 278801655 in words is "two hundred seventy-eight million, eight hundred one thousand, six hundred fifty-five".