2780081 has 4 divisors (see below), whose sum is σ = 2786112. Its totient is φ = 2774052.

The previous prime is 2780077. The next prime is 2780083. The reversal of 2780081 is 1800872.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2780081 - 2² = 2780077 is a prime.

It is a super-2 number, since 2×2780081² = 15457700733122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2780081.

It is not an unprimeable number, because it can be changed into a prime (2780083) 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, 2261 + ... + 3266.

It is an arithmetic number, because the mean of its divisors is an integer number (696528).

2^2780081 is an apocalyptic number.

It is an amenable number.

2780081 is a deficient number, since it is larger than the sum of its proper divisors (6031).

2780081 is an equidigital number, since it uses as much as digits as its factorization.

2780081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6030.

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 2780081 is about 1667.3574901622. The cubic root of 2780081 is about 140.6109524075.

It can be divided in two parts, 27 and 80081, that added together give a palindrome (80108).

The spelling of 2780081 in words is "two million, seven hundred eighty thousand, eighty-one".