2778693 has 24 divisors (see below), whose sum is σ = 4135200. Its totient is φ = 1653120.

The previous prime is 2778689. The next prime is 2778697. The reversal of 2778693 is 3968772.

It is an interprime number because it is at equal distance from previous prime (2778689) and next prime (2778697).

It is not a de Polignac number, because 2778693 - 2² = 2778689 is a prime.

It is a super-2 number, since 2×2778693² = 15442269576498, which contains 22 as substring.

2778693 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778697) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67753 + ... + 67793.

It is an arithmetic number, because the mean of its divisors is an integer number (172300).

2^2778693 is an apocalyptic number.

It is an amenable number.

2778693 is a deficient number, since it is larger than the sum of its proper divisors (1356507).

2778693 is a wasteful number, since it uses less digits than its factorization.

2778693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133 (or 92 counting only the distinct ones).

The product of its digits is 127008, while the sum is 42.

The square root of 2778693 is about 1666.9412107210. The cubic root of 2778693 is about 140.5875477547.

The spelling of 2778693 in words is "two million, seven hundred seventy-eight thousand, six hundred ninety-three".