2780761 has 2 divisors, whose sum is σ = 2780762. Its totient is φ = 2780760.

The previous prime is 2780753. The next prime is 2780773. The reversal of 2780761 is 1670872.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1742400 + 1038361 = 1320^2 + 1019^2 .

It is a cyclic number.

It is not a de Polignac number, because 2780761 - 2³ = 2780753 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2780161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390380 + 1390381.

It is an arithmetic number, because the mean of its divisors is an integer number (1390381).

2^2780761 is an apocalyptic number.

It is an amenable number.

2780761 is a deficient number, since it is larger than the sum of its proper divisors (1).

2780761 is an equidigital number, since it uses as much as digits as its factorization.

2780761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 2780761 is about 1667.5613931727. The cubic root of 2780761 is about 140.6224158208.

The spelling of 2780761 in words is "two million, seven hundred eighty thousand, seven hundred sixty-one".