2780087 has 4 divisors (see below), whose sum is σ = 2847936. Its totient is φ = 2712240.

The previous prime is 2780083. The next prime is 2780101. The reversal of 2780087 is 7800872.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2780087 - 2² = 2780083 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 33863 + ... + 33944.

It is an arithmetic number, because the mean of its divisors is an integer number (711984).

2^2780087 is an apocalyptic number.

2780087 is a deficient number, since it is larger than the sum of its proper divisors (67849).

2780087 is an equidigital number, since it uses as much as digits as its factorization.

2780087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67848.

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 2780087 is about 1667.3592894155. The cubic root of 2780087 is about 140.6110535634.

The spelling of 2780087 in words is "two million, seven hundred eighty thousand, eighty-seven".