2780006 has 4 divisors (see below), whose sum is σ = 4170012. Its totient is φ = 1390002.

The previous prime is 2779991. The next prime is 2780039. The reversal of 2780006 is 6000872.

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

It is a super-3 number, since 3×2780006³ = 64455273334500720648, which contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695000 + ... + 695003.

It is an arithmetic number, because the mean of its divisors is an integer number (1042503).

2^2780006 is an apocalyptic number.

2780006 is a deficient number, since it is larger than the sum of its proper divisors (1390006).

2780006 is a wasteful number, since it uses less digits than its factorization.

2780006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1390005.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 2780006 is about 1667.3349993328. The cubic root of 2780006 is about 140.6096879460.

Adding to 2780006 its reverse (6000872), we get a palindrome (8780878).

The spelling of 2780006 in words is "two million, seven hundred eighty thousand, six".