2778733 has 4 divisors (see below), whose sum is σ = 2824348. Its totient is φ = 2733120.

The previous prime is 2778697. The next prime is 2778739. The reversal of 2778733 is 3378772.

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

It can be written as a sum of positive squares in 2 ways, for example, as 964324 + 1814409 = 982^2 + 1347^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2778733 is a prime.

It is a Duffinian number.

2778733 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2778692 and 2778701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22716 + ... + 22837.

It is an arithmetic number, because the mean of its divisors is an integer number (706087).

2^2778733 is an apocalyptic number.

It is an amenable number.

2778733 is a deficient number, since it is larger than the sum of its proper divisors (45615).

2778733 is an equidigital number, since it uses as much as digits as its factorization.

2778733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45614.

The product of its digits is 49392, while the sum is 37.

The square root of 2778733 is about 1666.9532087014. The cubic root of 2778733 is about 140.5882223495.

The spelling of 2778733 in words is "two million, seven hundred seventy-eight thousand, seven hundred thirty-three".