2684781 has 24 divisors (see below), whose sum is σ = 4328064. Its totient is φ = 1589760.

The previous prime is 2684777. The next prime is 2684807. The reversal of 2684781 is 1874862.

It is not a de Polignac number, because 2684781 - 2² = 2684777 is a prime.

It is a super-2 number, since 2×2684781² = 14416098035922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2684701) 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, 4365 + ... + 4941.

It is an arithmetic number, because the mean of its divisors is an integer number (180336).

2^2684781 is an apocalyptic number.

It is an amenable number.

2684781 is a deficient number, since it is larger than the sum of its proper divisors (1643283).

2684781 is a wasteful number, since it uses less digits than its factorization.

2684781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641 (or 638 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 2684781 is about 1638.5301339920. The cubic root of 2684781 is about 138.9855409973.

The spelling of 2684781 in words is "two million, six hundred eighty-four thousand, seven hundred eighty-one".