2778455 has 4 divisors (see below), whose sum is σ = 3334152. Its totient is φ = 2222760.

The previous prime is 2778439. The next prime is 2778467. The reversal of 2778455 is 5548772.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2778455 - 2⁴ = 2778439 is a prime.

It is a Duffinian number.

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, 277841 + ... + 277850.

It is an arithmetic number, because the mean of its divisors is an integer number (833538).

2^2778455 is an apocalyptic number.

2778455 is a deficient number, since it is larger than the sum of its proper divisors (555697).

2778455 is an equidigital number, since it uses as much as digits as its factorization.

2778455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555696.

The product of its digits is 78400, while the sum is 38.

The square root of 2778455 is about 1666.8698209518. The cubic root of 2778455 is about 140.5835337823.

The spelling of 2778455 in words is "two million, seven hundred seventy-eight thousand, four hundred fifty-five".