2788655 has 4 divisors (see below), whose sum is σ = 3346392. Its totient is φ = 2230920.

The previous prime is 2788633. The next prime is 2788661. The reversal of 2788655 is 5568872.

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

It is a de Polignac number, because none of the positive numbers 2^k-2788655 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, 278861 + ... + 278870.

It is an arithmetic number, because the mean of its divisors is an integer number (836598).

2^2788655 is an apocalyptic number.

2788655 is a deficient number, since it is larger than the sum of its proper divisors (557737).

2788655 is an equidigital number, since it uses as much as digits as its factorization.

2788655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557736.

The product of its digits is 134400, while the sum is 41.

The square root of 2788655 is about 1669.9266450955. The cubic root of 2788655 is about 140.7553559982.

It can be divided in two parts, 2788 and 655, that added together give a palindrome (3443).

The spelling of 2788655 in words is "two million, seven hundred eighty-eight thousand, six hundred fifty-five".