2780864 has 14 divisors (see below), whose sum is σ = 5518404. Its totient is φ = 1390400.

The previous prime is 2780837. The next prime is 2780873. The reversal of 2780864 is 4680872.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21662 + ... + 21789.

2^2780864 is an apocalyptic number.

It is an amenable number.

2780864 is a deficient number, since it is larger than the sum of its proper divisors (2737540).

2780864 is an equidigital number, since it uses as much as digits as its factorization.

2780864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43463 (or 43453 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 2780864 is about 1667.5922763074. The cubic root of 2780864 is about 140.6241520278.

It can be divided in two parts, 27808 and 64, that added together give a palindrome (27872).

The spelling of 2780864 in words is "two million, seven hundred eighty thousand, eight hundred sixty-four".