2778478 has 8 divisors (see below), whose sum is σ = 4280472. Its totient is φ = 1351656.

The previous prime is 2778467. The next prime is 2778481. The reversal of 2778478 is 8748772.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18700 + ... + 18847.

It is an arithmetic number, because the mean of its divisors is an integer number (535059).

2^2778478 is an apocalyptic number.

2778478 is a deficient number, since it is larger than the sum of its proper divisors (1501994).

2778478 is a wasteful number, since it uses less digits than its factorization.

2778478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37586.

The product of its digits is 175616, while the sum is 43.

The square root of 2778478 is about 1666.8767200966. The cubic root of 2778478 is about 140.5839216972.

The spelling of 2778478 in words is "two million, seven hundred seventy-eight thousand, four hundred seventy-eight".