2787666 has 16 divisors (see below), whose sum is σ = 6371904. Its totient is φ = 796464.

The previous prime is 2787649. The next prime is 2787689. The reversal of 2787666 is 6667872.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 66373 = 2787666 / (2 + 7 + 8 + 7 + 6 + 6 + 6).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33145 + ... + 33228.

It is an arithmetic number, because the mean of its divisors is an integer number (398244).

2^2787666 is an apocalyptic number.

2787666 is an abundant number, since it is smaller than the sum of its proper divisors (3584238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2787666 is a wasteful number, since it uses less digits than its factorization.

2787666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66385.

The product of its digits is 169344, while the sum is 42.

The square root of 2787666 is about 1669.6304980444. The cubic root of 2787666 is about 140.7387143428.

The spelling of 2787666 in words is "two million, seven hundred eighty-seven thousand, six hundred sixty-six".