2775638 has 4 divisors (see below), whose sum is σ = 4163460. Its totient is φ = 1387818.

The previous prime is 2775637. The next prime is 2775649. The reversal of 2775638 is 8365772.

It is a happy number.

2775638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2775637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 693908 + ... + 693911.

It is an arithmetic number, because the mean of its divisors is an integer number (1040865).

2^2775638 is an apocalyptic number.

2775638 is a deficient number, since it is larger than the sum of its proper divisors (1387822).

2775638 is a wasteful number, since it uses less digits than its factorization.

2775638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1387821.

The product of its digits is 70560, while the sum is 38.

The square root of 2775638 is about 1666.0246096622. The cubic root of 2775638 is about 140.5360064419.

The spelling of 2775638 in words is "two million, seven hundred seventy-five thousand, six hundred thirty-eight".